

A218210


Number of primes up to 10^n that are of the form (k2)^2 + (k1)^2 + k^2.


4



2, 3, 6, 10, 22, 53, 139, 369, 1050, 2984, 8618, 24390
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OFFSET

1,1


COMMENTS

There are two primes < 10: 2 and 5.


LINKS

Table of n, a(n) for n=1..12.


FORMULA

a(n) = sum(A218209(k), k=1..n)


MATHEMATICA

n = 1; cnt = 0; Do[While[n++; p = 3*n^2 + 2; p < 10^e, If[PrimeQ[p], cnt++]]; n; cnt, {e, 10}] (* T. D. Noe, Oct 23 2012 *)


CROSSREFS

Cf. A027863, A027864, A218208, A218209, A218212.
Sequence in context: A156803 A002992 A130867 * A122381 A141034 A300442
Adjacent sequences: A218207 A218208 A218209 * A218211 A218212 A218213


KEYWORD

nonn,base


AUTHOR

Martin Renner, Oct 23 2012


STATUS

approved



