A247252 Smallest integer k>=1 such that k*prime(n) is the sum of two successive primes.

4, 4, 1, 6, 18, 4, 4, 8, 6, 24, 6, 6, 10, 4, 12, 24, 8, 20, 4, 12, 20, 28, 18, 8, 12, 18, 6, 12, 8, 22, 4, 6, 4, 12, 8, 6, 24, 6, 4, 36, 18, 36, 20, 4, 24, 20, 30, 4, 24, 6, 16, 52, 6, 18, 6, 30, 42, 18, 30, 24, 4, 6, 24, 6, 6, 8, 8, 6, 12, 12, 24, 8, 26, 12, 10, 16, 6, 12, 8, 42, 14, 10, 18, 6, 8, 12, 30, 36, 48, 22, 12, 14, 4, 12, 20, 16, 6, 6, 6, 20

Offset

1,1

Comments

Except for a(3)=1, all terms are even and >= 4.

Links

Zak Seidov, Table of n, a(n) for n = 1..1000

Formula

a(n) = A203836(n)/prime(n).

Example

If n=1, prime(1)=2, and 4*2 = 8 = 3+5 is the sum of two consecutive primes, thus a(1) = 4.

Crossrefs

Cf. A000040, A001043, A203836, A247245.

Sequence in context: A263493 A166237 A021878 * A016495 A335826 A337191

Adjacent sequences: A247249 A247250 A247251 * A247253 A247254 A247255

Keyword

nonn

Author

Zak Seidov, Nov 29 2014

Status

approved