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Old 2015-10-09, 02:21   #2
science_man_88
 
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Jul 2009
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Quote:
Originally Posted by ewmayer View Post
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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