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A294574
Numbers having exactly one representation as sum of squares of primes.
0
4, 8, 9, 12, 13, 16, 17, 18, 20, 21, 22, 24, 26, 27, 28, 30, 31, 32, 35, 39
OFFSET
1,1
FORMULA
A090677(a(n)) = 1.
MATHEMATICA
Flatten[Position[Rest[CoefficientList[Series[Product[1/(1 - x^(Prime[k]^2)), {k, 1, 5}], {x, 0, 40}], x]], 1]]
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Ilya Gutkovskiy, Nov 02 2017
STATUS
approved