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 A180347 The number of n-digit numbers requiring 4 nonzero squares in their representation as sum of squares. 3
 1, 14, 150, 1500, 14999, 150000, 1499999, 15000000, 149999998, 1500000001, 14999999999, 149999999999, 1500000000001, 14999999999999, 149999999999999, 1500000000000001, 14999999999999998, 149999999999999999, 1500000000000000003, 14999999999999999996 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A049415(n) + A180426(n) + A180429(n) + a(n) = A052268(n) LINKS Eric W. Weisstein: MathWorld : Lagrange's Four-Square Theorem. Eric W. Weisstein: MathWorld: Sum of Squares Function. FORMULA a(n) = A167615(n)-A167615(n-1) CROSSREFS Cf. A004215, A167615 Sequence in context: A009614 A009802 A153598 * A037960 A222677 A016163 Adjacent sequences:  A180344 A180345 A180346 * A180348 A180349 A180350 KEYWORD nonn,base AUTHOR Martin Renner, Jan 18 2011 STATUS approved

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Last modified December 21 23:06 EST 2014. Contains 252326 sequences.