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A247252 Smallest integer k>=1 such that k*prime(n) is the sum of two successive primes. 2
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 (list; graph; refs; listen; history; text; internal format)
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 A047213 A128213

Adjacent sequences:  A247249 A247250 A247251 * A247253 A247254 A247255

KEYWORD

nonn

AUTHOR

Zak Seidov, Nov 29 2014

STATUS

approved

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Last modified May 25 23:50 EDT 2020. Contains 334612 sequences. (Running on oeis4.)