A263619 Number of palindromic squares with at most n digits.

4, 4, 7, 7, 14, 15, 20, 20, 31, 31, 36, 37, 56, 56, 69, 70, 95, 95, 113, 113

Offset

1,1

Comments

Partial sums of A263618.

Links

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

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

Cf. A002778, A002779, A263617, A263617, A263618, A263620.

Sequence in context: A168233 A238391 A049647 * A046538 A353713 A107432

Adjacent sequences: A263616 A263617 A263618 * A263620 A263621 A263622

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

Status

approved