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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

Index entries for characteristic functions

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.)