login
A180426
The number of n-digit numbers requiring 2 nonzero squares in their representation as sum of squares.
3
3, 30, 265, 2351, 21062, 191630, 1766955, 16465551, 154749588, 1464326721, 13932672360, 133165432342, 1277568139729, 12295904124627, 118665023703067, 1147922359531155
OFFSET
1,1
COMMENTS
A049415(n) + a(n) + A180429(n) + A180347(n) = A052268(n)
FORMULA
a(n) = A180416(n)-A180416(n-1) for n>1.
CROSSREFS
Sequence in context: A178015 A120689 A359614 * A246246 A136896 A121085
KEYWORD
nonn,more,base
AUTHOR
Martin Renner, Jan 19 2011
EXTENSIONS
a(5)-a(8) from Alois P. Heinz, Jan 20 2011
a(9)-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