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A220188
Number of representations of n-th prime as 2p + 3q (p, q primes not necessarily distinct).
1
0, 0, 0, 0, 0, 1, 0, 2, 1, 1, 2, 2, 1, 4, 3, 2, 2, 4, 4, 3, 4, 4, 4, 2, 5, 3, 5, 4, 3, 3, 6, 4, 4, 5, 4, 7, 5, 6, 6, 6, 5, 6, 5, 6, 6, 6, 7, 9, 8, 7, 6, 6, 7, 7, 6, 9, 5, 10, 7, 5, 9, 6, 9, 7, 10, 8, 10, 8, 10, 10, 8, 7, 10, 8, 7, 9, 6, 10, 8, 8, 9, 10, 10, 10
OFFSET
1,8
COMMENTS
For n>7 a(n)>0.
MATHEMATICA
s={}; Do[mx = Prime[k]; c = 0; Do[p = Prime[k]; If[PrimeQ[q = (mx - 3 p)/2] , c++], {k, PrimePi[(mx - 4)/3]}]; AppendTo[s, c], {k, 200}]; s
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Dec 07 2012
STATUS
approved