A185705 Characteristic function of positive numbers that are primes ending in 1.

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, 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, 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

Offset

1

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for characteristic functions

Prog

(PARI) A185705(n) = ((1==(n%10))&&isprime(n)); \\ Antti Karttunen, Sep 21 2018

Crossrefs

Cf. A030430 (primes of the form 10*n+1).

Primes ending in 1,3,7,9: A185705, A185706, A185708, A185709.

Sequence in context: A037808 A023973 A297040 * A369667 A358773 A044941

Adjacent sequences: A185702 A185703 A185704 * A185706 A185707 A185708

Keyword

nonn,base

Author

N. J. A. Sloane, Feb 10 2011

Status

approved