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A263619
Number of palindromic squares with at most n digits.
2
4, 4, 7, 7, 14, 15, 20, 20, 31, 31, 36, 37, 56, 56, 69, 70, 95, 95, 113, 113, 161, 162, 193, 193, 263, 264, 308, 310, 415, 415, 485, 486, 639, 640, 738, 741, 950, 950, 1082, 1082, 1373, 1374, 1555, 1556
OFFSET
1,1
COMMENTS
Partial sums of A263618.
LINKS
G. J. Simmons, Palindromic powers, J. Rec. Math., 3 (No. 2, 1970), 93-98. [Annotated scanned copy] See page 95.
MATHEMATICA
Table[Length[Select[Range[0, Floor[Sqrt[10^n]]], PalindromeQ[#^2] &]], {n, 10}] (* Robert Price, Apr 26 2019 *)
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
N. J. A. Sloane, Oct 23 2015
EXTENSIONS
a(13)-a(19) from Chai Wah Wu, Oct 24 2015
a(20) from Robert Price, Apr 26 2019
More terms using A263618 from Chai Wah Wu, Jun 14 2024
STATUS
approved