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A218211 Number of n-digit primes that are the sum of six consecutive squares of nonnegative numbers. 4
0, 0, 4, 10, 15, 49, 147, 407, 1084, 3010, 8756, 25145, 73424, 215375, 631828, 1870092, 5562131, 16584139, 49630873, 148917071, 448088250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

These are the primes of the form 91 + 42*k + 6*k^2.

LINKS

Table of n, a(n) for n=1..21.

FORMULA

a(n) = A218212(n) - A218212(n-1)

MATHEMATICA

n = 0; Table[cnt = 0; While[n++; p = 91 + 42*n + 6*n^2; p < 10^e, If[PrimeQ[p], cnt++]]; n--; cnt, {e, 14}] (* T. D. Noe, Oct 23 2012 *)

CROSSREFS

Cf. A027866, A027867, A218207, A218209, A218212.

Sequence in context: A310472 A005662 A259262 * A302197 A190965 A099457

Adjacent sequences:  A218208 A218209 A218210 * A218212 A218213 A218214

KEYWORD

nonn,base,more

AUTHOR

Martin Renner, Oct 23 2012

EXTENSIONS

a(13)-a(21) from Chai Wah Wu, Feb 12 2018

a(2) changed back to 0 by Chai Wah Wu and N. J. A. Sloane, Feb 13 2018

STATUS

approved

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Last modified April 5 00:43 EDT 2020. Contains 333238 sequences. (Running on oeis4.)