login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 * A262183 A037960 A222677

Adjacent sequences:  A180344 A180345 A180346 * A180348 A180349 A180350

KEYWORD

nonn,base

AUTHOR

Martin Renner, Jan 18 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 10 11:31 EST 2016. Contains 279001 sequences.