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

Author

Zak Seidov, Nov 29 2014

Keywords

• nonn

Comments

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

Examples

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

Links

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

Crossrefs

Cf. A000040, A001043, A203836, A247245.

Formula

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