Forum: Miscellaneous Math
2021-02-26, 19:49
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Replies: 7
Views: 190
You can use the sense in Factors of Fermat...
You can use the sense in Factors of Fermat numbers (http://www.prothsearch.com/fermat.html) and Factors of double Mersenne numbers (http://www.doublemersennes.org/history.php).
Since such numbers...
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Forum: sweety439
2021-02-25, 22:40
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Replies: 1,200
Views: 59,653
Riesel base 171
1,181
2,2
3,60
4,1
5,0
6,2
7,68
8,1
9,1
10,1
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Forum: sweety439
2021-02-25, 22:33
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Replies: 1,200
Views: 59,653
Riesel base 170
1,17
2,166428
3,1
4,3
5,38
6,1
7,3
8,15422
9,7
10,1
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Forum: sweety439
2021-02-25, 22:29
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Replies: 1,200
Views: 59,653
Riesel base 169
1,(full algebra factors)
2,1
3,2
4,(full algebra factors)
5,1
6,1
7,1
8,1
9,(full algebra factors)
10,1
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Forum: sweety439
2021-02-25, 22:27
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Replies: 1,200
Views: 59,653
Riesel base 168
1,3
168,2
335,1
502,3
669,1
836,3
1003,1
1170,14
1337,2
1504,3
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Forum: sweety439
2021-02-25, 22:24
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Replies: 1,200
Views: 59,653
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Forum: sweety439
2021-02-25, 20:56
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Replies: 1,200
Views: 59,653
Riesel base 166
searched to n=2000, see the text file for the status, 0 if no (probable) prime found for this k
CK=4174
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Forum: sweety439
2021-02-25, 01:44
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Replies: 1,200
Views: 59,653
Riesel base 165
1,5
2,2
3,3
4,1
5,2
6,86
7,1
8,1
9,9
10,2
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Forum: sweety439
2021-02-25, 01:41
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Replies: 1,200
Views: 59,653
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Forum: sweety439
2021-02-25, 01:39
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Replies: 1,200
Views: 59,653
Riesel base 163
1,7
2,84
3,20
4,2285
5,5
6,1
7,6
8,1
9,1
10,1
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Forum: sweety439
2021-02-24, 23:55
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Replies: 1,200
Views: 59,653
Riesel base 162
searched to n=2000, see the text file for the status, 0 if no (probable) prime found for this k
CK=3259
Only list k == 1 mod 7 and k == 1 mod 23 since other k are already in CRUS
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Forum: Miscellaneous Math
2021-02-24, 18:53
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Replies: 7
Views: 190
It is also happens for double Wagstaff numbers...
It is also happens for double Wagstaff numbers (https://mersenneforum.org/showthread.php?t=24542), W(W(p)) is composite for p = 11, 13, 17, 19, 23, 31, 61, and 79, and W(W(43)) might be prime, but...
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Forum: Miscellaneous Math
2021-02-24, 18:52
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Replies: 7
Views: 190
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Forum: sweety439
2021-02-24, 18:36
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Replies: 1,200
Views: 59,653
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Forum: sweety439
2021-02-24, 18:29
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Replies: 1,200
Views: 59,653
Update the status of Sierpinski problems...
Update the status of Sierpinski problems (https://docs.google.com/document/d/e/2PACX-1vSQlPrWZgVM1g5spyMs_USkKy3XEGcBsadeLc82JmQVbXCOWbbcSkuHMtO_EmspQME3ITGNvoCcffZt/pub) to include the new primes...
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Forum: sweety439
2021-02-24, 18:20
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Replies: 1,200
Views: 59,653
Update the status of Riesel problems...
Update the status of Riesel problems (https://docs.google.com/document/d/e/2PACX-1vReofbA92gRRhzqjKA3TKOqsukineM59WpM56LuRnbhB7bBFSYL6w-aTJ2IpJPWpiyCmPLOSE6gqDrR/pub) to include the new primes for R2...
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Forum: Miscellaneous Math
2021-02-24, 18:07
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Replies: 7
Views: 190
This is double-exponent sequence, thus it is...
This is double-exponent sequence, thus it is conjectured that the number of such primes is finite, and 2^521-1 may be the largest such prime, like 65537 may be the largest Fermat prime, and 2^127-1...
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Forum: sweety439
2021-02-24, 02:35
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Replies: 127
Views: 11,672
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Forum: sweety439
2021-02-23, 12:42
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Replies: 127
Views: 11,672
See...
See https://primes.utm.edu/glossary/page.php?sort=emirp and https://oeis.org/A006567, palindromic primes are not emirps, emirps are primes whose reversal is a DIFFERENT prime.
Also, both posts...
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Forum: sweety439
2021-02-22, 16:42
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Replies: 127
Views: 11,672
For the number of elements in the minimal set of...
For the number of elements in the minimal set of some sets, such as squares (1, 4, 9, 25, 36, 576, 676, 7056, 80656, 665856, 2027776, 2802276, 22282727076, 77770707876, 78807087076, 7888885568656,...
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Forum: sweety439
2021-02-22, 13:49
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Replies: 127
Views: 11,672
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Forum: sweety439
2021-02-22, 13:40
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Replies: 127
Views: 11,672
Minimal set of emirps in decimal:
{13, 17,...
Minimal set of emirps in decimal:
{13, 17, 31, 37, 71, 73, 79, 97, 149, 199, 359, 389, 941, 953, 983, 991, 1009, 1021, 1061, 1069, 1091, 1109, 1151, 1181, 1201, 1229, 1259, 1511, 1559, 1601, 1619,...
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Forum: Miscellaneous Math
2021-02-21, 15:23
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Replies: 4
Views: 159
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Forum: sweety439
2021-02-21, 11:44
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Replies: 127
Views: 11,672
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Forum: sweety439
2021-02-21, 11:34
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Replies: 127
Views: 11,672
Although some such minimal sets are not known,...
Although some such minimal sets are not known, and might be extremely difficult to found (these sets may be more difficult to found in larger bases, such as bases 17 through 64), the basic theorem of...
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