A353464 Characteristic function of greater twin primes: a(n) = 1 if both n and n-2 are primes, otherwise 0.

0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 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, 1, 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, 1, 0

Offset

1

Links

Antti Karttunen, Table of n, a(n) for n = 1..100000

Index entries for characteristic functions

Formula

a(n) = A353463(n-2) = A010051(n) * A010051(n-2).

Prog

(PARI) A353464(n) = (isprime(n) && isprime(n-2));

Crossrefs

Characteristic function of A006512.

Cf. A010051, A353463.

Sequence in context: A179831 A094091 A080679 * A144193 A171387 A355450

Adjacent sequences: A353461 A353462 A353463 * A353465 A353466 A353467

Keyword

nonn

Author

Antti Karttunen, Apr 22 2022

Status

approved