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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

Table of n, a(n) for n=1..20.

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 November 29 03:09 EST 2014. Contains 250479 sequences.