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 Showing results 1 to 25 of 538 Search took 0.10 seconds. Search: Posts Made By: enzocreti
 Forum: enzocreti 2022-09-23, 10:10 Replies: 2 Views: 339 Posted By enzocreti 1666667*2 mod 666667 how do you see that -1666667x2=1 mod 666667? I simply tried but is there a method to "see" it?
 Forum: enzocreti 2022-09-21, 07:35 Replies: 5 Views: 502 Posted By enzocreti odd but 13 is odd
 Forum: enzocreti 2022-09-19, 09:28 Replies: 5 Views: 502 Posted By enzocreti numbers of the form 24n+2 Is it correct that every number of the form 24n+2 cannot be of the form 3m+1? for m,n positive integers? mod 3 this should yeld to 2=1 mod 3? using chinese remainder theorem only numbers...
 Forum: enzocreti 2022-09-14, 18:21 Replies: 1 Views: 473 Posted By enzocreti How to prove that only Powers of 6^(6+35j) are of the form648+23004s This Is a Little more difficult: How to prove that Powers 6^(6+35j) for j nonnegative integer are of the form 648+23004s and only that powers . I mean there Is no orher 6^g of the form...
 Forum: enzocreti 2022-09-13, 09:30 Replies: 4 Views: 447 Posted By enzocreti the congruence should be equal to 6^6=0 mod... the congruence should be equal to 6^6=0 mod 4 6^6=0 mod 81 6^6=9 mod 71 so the least exponent k for which 6^k=1 is k=35 a divisor of (71-1)=0
 Forum: enzocreti 2022-09-13, 07:22 Replies: 4 Views: 447 Posted By enzocreti Proving every 6^(6+35j)=648 mod 23004 How to prove that every 6^(6+35j) for nonnegative j is congruent to 648 mod 23004? By Fermat litle theorem I can say (71-1)=70, 35 divides 70, so 6^35=1 mod 71 But how to continue the proof?
 Forum: enzocreti 2022-03-06, 12:54 Replies: 14 Views: 13,261 Posted By enzocreti 3067 is a prime there is a very complex... 3067 is a prime there is a very complex hidden structure 331259/3680 is very close to 90 7775*23005+1 Is a Square -331259=3067-1 mod 7775
 Forum: enzocreti 2022-01-03, 13:06 Replies: 14 Views: 13,261 Posted By enzocreti 92233=427x6^3+1 92233=6^3=51456 mod 427 ... 92233=427x6^3+1 92233=6^3=51456 mod 427 ((92233-51456)-1)/3-12592=10^3
 Forum: enzocreti 2021-07-11, 20:35 Replies: 14 Views: 13,261 Posted By enzocreti 215*107*12^2 is congruent to -71*6^6 which is... 215*107*12^2 is congruent to -71*6^6 which is congruent to 72 mod (331*139) 331*139*8 is congruent to -8 mod (215*107) s^2 is congruent to 1 mod 23005 the first not trivial solution is
 Forum: enzocreti 2021-07-11, 19:07 Replies: 14 Views: 13,261 Posted By enzocreti ... the last you said
 Forum: enzocreti 2021-07-11, 10:02 Replies: 14 Views: 13,261 Posted By enzocreti Now i consider 215*107*x is congruent to 1... Now i consider 215*107*x is congruent to 1 mod (331*139) the solution is x=2+46009*s, for some s when s=8 (215*107*(2+46009*8)-1)/(331*139)=429^2=2*92020+1
 Forum: enzocreti 2020-10-27, 13:01 Replies: 10 Views: 3,689 Posted By enzocreti a difficult problem Let be N a nonnegative integer. I search integers N such that N+20=s^2*p and N+19=q^2*(2*p+1), where s and q are integers>1 and p is a prime>2 and (2p+1) is a prime as well.
 Forum: enzocreti 2020-09-30, 13:44 Replies: 2 Views: 2,679 Posted By enzocreti How to proof that numbers 18, 108, 1008,...will never be divisible by 6^4? How to proof that numbers of the form 18, 108, 1008, 10008, 100008, 1000...0008 will never be divisible by 6^4?
 Forum: enzocreti 2020-09-29, 14:46 Replies: 1 Views: 2,106 Posted By enzocreti Is 56238 the only N with this property? Is 56238 the only positive integer N such that sigma(N)/546=2^j, where j is a positive integer? sigma is the sum of the divisors of N
 Forum: enzocreti 2020-09-29, 09:26 Replies: 3 Views: 2,478 Posted By enzocreti sigma(n)=x*(x+1)^3 let be sigma(n) the sum of the divisors of n something is known about numbers n such that sigma(n)=x*(x+1)^3 with x positive integer?
 Forum: enzocreti 2020-09-01, 08:43 Replies: 3 Views: 4,121 Posted By enzocreti ...factorial(n) plus/minus 1 is semiprime Is there an Oeis sequence dedicated to numbers n such that n!+1 and n!-1 are both semiprime? An example is 20970 Infact 20970!+1 is semiprime and also 20970!-1 is semi prime No the...
 Forum: enzocreti 2020-09-01, 07:53 Replies: 20 Views: 6,937 Posted By enzocreti ...i did not... i did not take into account that N must be 10^m mod 41 let's guess congruent to 1 mod 41
 Forum: enzocreti 2020-09-01, 07:32 Replies: 20 Views: 6,937 Posted By enzocreti ...not that's not prp how about this: (2^1430136-1)*10^430514+2^1430135-1??? I made a stupid mistacke the candidates have the form
 Forum: enzocreti 2020-09-01, 07:21 Replies: 20 Views: 6,937 Posted By enzocreti ...but this is almost surely PRP! (2^3680800-1)*10^1108031+2^3680799-1
 Forum: enzocreti 2020-08-31, 15:43 Replies: 20 Views: 6,937 Posted By enzocreti Pg(69660) is prime 69660 is multiple of... Pg(69660) is prime 69660 is multiple of 215 and congruent to 215 mod 323...it is also 6 mod 13... using wolphram numbers of this form are 69660+xn where x i don't remember what it is. 69660...
 Forum: enzocreti 2020-08-31, 13:52 Replies: 20 Views: 6,937 Posted By enzocreti Unfortunally my computer is broken! Unfortunally my computer is broken!
 Forum: enzocreti 2020-08-31, 11:27 Replies: 20 Views: 6,937 Posted By enzocreti probable dud ((2^1875230-1)*10^564501+2^1875229-1) has small factors? I don't know...:smile:
 Forum: enzocreti 2020-08-29, 08:01 Replies: 11 Views: 7,688 Posted By enzocreti ... 56238... 56238 is a not palindromic number such that the reverse 83265 (squarefree) also belongs to Oeis sequence A165256. Are there other examples of not palindromic numbers belonging to A165256 whose...
 Forum: enzocreti 2020-08-28, 18:02 Replies: 11 Views: 7,688 Posted By enzocreti Are 56238 and 75894 the only multiple of 546... Are 56238 and 75894 the only multiple of 546 squarefree belonging to the sequence A165256 ?
 Forum: enzocreti 2020-08-28, 16:42 Replies: 11 Views: 7,688 Posted By enzocreti ... 75894... Pg(56238) is prime and also pg(75894) is prime 56238 and 75894 are multiple of 546. 56238 and 75894 are square free and belong to the Oeis sequence you mentioned Pg(n) is the concatenation...
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