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 A180429 The number of n-digit numbers requiring 3 nonzero squares in their representation as sum of squares. 3
 2, 40, 463, 5081, 53722, 557687, 5730883, 58527612, 595228791, 6035604901, 61067111413, 616833883887, 6222429697992, 62704089037652, 631334954674157, 6352077572091621 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A049415(n) + A180426(n) + a(n) + A180347(n) = A052268(n) LINKS Table of n, a(n) for n=1..16. Eric Weisstein's World of Mathematics, Lagrange's Four-Square Theorem, Sum of Squares Function. FORMULA a(n) = A180425(n)-A180425(n-1) for n>1. CROSSREFS Cf. A000419, A180425. Sequence in context: A092698 A181175 A035604 * A108033 A160229 A012807 Adjacent sequences: A180426 A180427 A180428 * A180430 A180431 A180432 KEYWORD nonn,more,base AUTHOR Martin Renner, Jan 19 2011 EXTENSIONS a(6) from Lars Blomberg, Jun 29 2011 a(7)-a(10) from Donovan Johnson, Jul 01 2011 a(10) corrected and a(11)-a(16) added by Hiroaki Yamanouchi, Aug 30 2014 STATUS approved

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Last modified September 17 05:28 EDT 2024. Contains 375985 sequences. (Running on oeis4.)