A067618 - OEIS

A067618

Number of self-conjugate partitions of n into prime parts.

1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 2, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 2, 0, 0, 1, 4, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 1, 3, 0, 0, 0, 5, 0, 0, 1, 6, 0, 0, 0, 3, 0, 0, 0, 5, 0, 0, 0, 6, 0, 0, 1, 5, 0, 0, 0, 7, 0, 0, 0, 9, 0, 0, 0, 5, 0

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OFFSET

0,26

LINKS

Table of n, a(n) for n=0..102.

MATHEMATICA

f[0, m_, k_] := 1; f[n_, 0, k_] := If[n==0, 1, 0]; f[n_, m_, k_] := If[n<0||m<0, 0, Module[{r}, f[n, m, k]=f[n, m-1, k]+If[PrimeQ[m+k], Sum[If[PrimeQ[r+k], f[n-r(2m-r), m-r-1, k+r], 0], {r, 1, m}], 0]]]; a[n_] := f[n, Floor[n/4]+1, 0]; (* f[n, m, k] = number of self-conjugate partitions of n with parts <= m such that every part+k is prime *)

CROSSREFS

Cf. A000700, A000701, A046682.

Sequence in context: A056170 A248395 A059483 * A279255 A055029 A126812

Adjacent sequences: A067615 A067616 A067617 * A067619 A067620 A067621

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto, Feb 01 2002

EXTENSIONS

Edited by Dean Hickerson, Feb 11 2002

STATUS

approved