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 A185708 Characteristic function of positive numbers that are primes ending in 7. 6
 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 PROG (PARI) A185708(n) = ((7==(n%10))&&isprime(n)); \\ Antti Karttunen, Oct 09 2018 CROSSREFS Cf. A030432 (primes of form 10n+7). Sequence in context: A188436 A293162 A175854 * A286996 A275305 A265757 Adjacent sequences:  A185705 A185706 A185707 * A185709 A185710 A185711 KEYWORD base,nonn AUTHOR N. J. A. Sloane, Feb 10 2011 STATUS approved

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Last modified November 15 22:20 EST 2018. Contains 317252 sequences. (Running on oeis4.)