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A079055 Numbers of prime pairs (p,q), p<=q, such that (p+q) divides n. 0
0, 0, 0, 1, 1, 1, 1, 2, 1, 3, 0, 3, 1, 3, 2, 4, 0, 4, 1, 6, 2, 3, 0, 7, 2, 4, 1, 6, 0, 8, 1, 6, 1, 4, 2, 10, 0, 3, 2, 10, 0, 9, 1, 7, 4, 4, 0, 14, 2, 8, 0, 8, 0, 9, 2, 10, 1, 4, 0, 18, 1, 4, 4, 11, 2, 11, 0, 7, 1, 11, 0, 20, 1, 5, 4, 9, 1, 13, 0, 16, 2, 5, 0, 21, 2, 6, 0, 12, 0, 21, 3, 9, 1, 5, 2, 23, 0, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..98.

PROG

(PARI) a(n)=sum(i=1, n, sum(j=1, i, if(n%(prime(i)+prime(j)), 0, 1)))

CROSSREFS

Sequence in context: A004563 A146094 A098035 * A122170 A066029 A141198

Adjacent sequences:  A079052 A079053 A079054 * A079056 A079057 A079058

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 02 2003

STATUS

approved

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Last modified November 14 17:12 EST 2018. Contains 317210 sequences. (Running on oeis4.)