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A068320 a(n)=number of arithmetic progressions of primes, strictly increasing with sum n. 0
0, 1, 1, 0, 2, 0, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 1, 3, 1, 2, 0, 2, 1, 3, 2, 2, 3, 3, 0, 4, 1, 1, 3, 3, 1, 4, 2, 3, 1, 3, 1, 5, 1, 4, 3, 3, 1, 5, 1, 4, 1, 3, 1, 6, 2, 2, 1, 5, 0, 6, 1, 2, 4, 5, 1, 6, 2, 4, 1, 5, 0, 7, 1, 5, 1, 4, 1, 8, 2, 4, 3, 4, 1, 9, 1, 5, 2, 4, 0, 7, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..97.

CROSSREFS

Sequence in context: A056562 A280008 A135220 * A111330 A225152 A117447

Adjacent sequences:  A068317 A068318 A068319 * A068321 A068322 A068323

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto, Feb 27 2002

STATUS

approved

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Last modified July 21 21:14 EDT 2019. Contains 325199 sequences. (Running on oeis4.)