Numbers n such that the number of strong primes and the number of weak primes are equal at the n-th prime.
60, 64, 41192, 41194, 41247, 41250, 41252, 41257, 41259, 41261, 41263, 41265
2 seqfan posts
Sun Feb 7 21:47:00 CET 2010 [seqfan] Re: A137921 & "divisor Islands"