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 A218213 Number of n-digit primes representable as sums of consecutive squares. 2
 1, 4, 13, 30, 69, 187, 519, 1401, 3889, 10861, 31640, 90735 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS There are no common representations of two, three or six squares for n < 13, so a(n) = A218207(n) + A218209(n) + A218211(n); n < 13. LINKS Table of n, a(n) for n=1..12. FORMULA a(n) = A218214(n) - A218213(n-1). MATHEMATICA nn = 8; nMax = 10^nn; t = Table[0, {nn}]; Do[k = n; s = 0; While[s = s + k^2; s <= nMax, If[PrimeQ[s], t[[Ceiling[Log[10, s]]]]++]; k++], {n, Sqrt[nMax]}]; t (* T. D. Noe, Oct 23 2012 *) CROSSREFS Cf. A027861, A027862, A027863, A027864, A027866, A027867, A218207, A218209, A218211. Sequence in context: A206806 A022913 A232228 * A075880 A042487 A154753 Adjacent sequences: A218210 A218211 A218212 * A218214 A218215 A218216 KEYWORD nonn,base AUTHOR Martin Renner, Oct 23 2012 STATUS approved

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Last modified August 10 22:34 EDT 2024. Contains 375058 sequences. (Running on oeis4.)