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2020-02-14, 10:50
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#1 |
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Mar 2018
17·31 Posts |
sum of two positive cubes congruent to 1 mod Mersenne prime
344 and 559 are multiple of 43 and congruent to 1 mod a Mersenne prime
344 is infact congruent to 1 mod 7 (the greatest factor is 7) (344-1)=7*7*7 (the greatest factor is 7) 559 is congruent to 1 mod 31 (the greatest factor is 31) (558=...*31) 344 and 559 are sum of two positive cubes are there other number k that are multiple of 43, sum of two positive cubes and such that the greatest factor of (k-1) is a Mersenne prime? Last fiddled with by enzocreti on 2020-02-14 at 10:51 |
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2020-02-14, 12:23
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#2 | |
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Nov 2016
B0316 Posts |
Quote:
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2020-02-14, 12:36
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#3 |
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Mar 2018
52710 Posts |
....
it is not multiple of 43
559 is multiple of 43 and congruent to 1 mod 31 |
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