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A263617 Number of numbers with at most n digits whose square is a palindrome. 4
4, 7, 15, 20, 31, 37, 56, 70, 95, 113, 162, 193, 264, 310, 415, 486, 640, 741, 950, 1082, 1374, 1556 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
G. J. Simmons, Palindromic powers, J. Rec. Math., 3 (No. 2, 1970), 93-98. [Annotated scanned copy]. See p. 95.
MATHEMATICA
Table[Length[Select[Range[ 0, 10^n - 1], PalindromeQ[#^2] &]], {n, 6}] (* Robert Price, Apr 26 2019 *)
CROSSREFS
Partial sums of A263616.
Sequence in context: A310927 A049832 A092309 * A271675 A356714 A039669
KEYWORD
nonn,base,more
AUTHOR
N. J. A. Sloane, Oct 23 2015
EXTENSIONS
a(9)-a(10) from Chai Wah Wu, Oct 25 2015
a(11)-a(12) from Michael S. Branicky, May 23 2021
a(13)-a(22) (using A002778) from Chai Wah Wu, Sep 16 2021
STATUS
approved

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Last modified February 27 21:03 EST 2024. Contains 370378 sequences. (Running on oeis4.)