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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 (list; graph; refs; listen; history; text; internal format)
 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 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

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Last modified December 2 15:42 EST 2022. Contains 358510 sequences. (Running on oeis4.)