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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..20.

Index entries for sequences related to sums of squares

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

Cf. A001248, A078135, A078136, A090677, A134755.

Sequence in context: A296696 A297129 A078137 * A010453 A078136 A291791

Adjacent sequences:  A294571 A294572 A294573 * A294575 A294576 A294577

KEYWORD

nonn,fini,full

AUTHOR

Ilya Gutkovskiy, Nov 02 2017

STATUS

approved

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Last modified August 22 20:42 EDT 2019. Contains 326197 sequences. (Running on oeis4.)