A137919 (Nextprime(24n)-previousprime(24n))/2.

3, 3, 1, 4, 7, 5, 3, 1, 6, 1, 3, 5, 1, 3, 4, 3, 4, 1, 4, 4, 3, 9, 5, 3, 1, 6, 3, 6, 5, 4, 4, 4, 5, 5, 7, 7, 10, 4, 4, 7, 4, 6, 1, 5, 9, 3, 3, 1, 5, 4, 3, 6, 9, 3, 1, 17, 3, 9, 7, 4, 6, 1, 6, 6, 4, 7, 1, 5, 10, 12, 5, 5, 3, 9, 6, 4, 7, 1, 6, 9, 8, 11, 3, 3, 7, 3, 1, 1, 3, 4, 12, 3, 8, 8, 4, 6, 11, 3, 3, 6, 7, 6

Offset

1,1

Comments

a(n)=1 if 24n -/+ 1 are twin primes.

Corresponding n's are in A137920.

Links

Table of n, a(n) for n=1..102.

Mathematica

Table[(NextPrime[24n]-NextPrime[24n, -1])/2, {n, 110}] (* Harvey P. Dale, Apr 15 2015 *)

Prog

(PARI) a(n) = (nextprime(24*n) - precprime(24*n))/2; \\ Michel Marcus, Oct 13 2013

Crossrefs

Cf. A124519, A135023, A135368, A137876, A137877, A137920.

Sequence in context: A226576 A297902 A298496 * A079081 A199775 A193740

Adjacent sequences: A137916 A137917 A137918 * A137920 A137921 A137922

Keyword

nonn

Author

Zak Seidov, Feb 23 2008

Status

approved