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Expected number of primes in OEIS A007908
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2015-10-09, 02:21
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science_man_88
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Quote:
Originally Posted by
ewmayer
Recently Neil Sloane (curator of the OEIS) sent a message to the NMBRTHRY mailing list re. the sequence
A007908
:
http://mersenneforum.org/showthread....hlight=A007908
and :
Quote:
Originally Posted by
https://oeis.org/A007908
Elementary congruence arguments show that primes can occur only at indices congruent to 1, 7, 13, or 19 mod 30. - Roderick MacPhee, Oct 05 2015
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