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A098701 Number of solutions to rev(x^2) = rev(x)^2 with n digits, where the rev(x) function reverses the digits of x. 2
3, 6, 15, 39, 90, 209, 457, 991, 2062, 4288, 8521, 17075, 33108, 64073, 121045, 228811, 423188, 781582, 1420445, 2571855, 4599072, 8187723, 14426529, 25278777, 43966808, 75959592, 130496955, 222598065, 378036562, 637128539, 1071282807 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Excludes multiples of 10.

LINKS

Table of n, a(n) for n=1..31.

CROSSREFS

Cf. A085305.

Sequence in context: A279374 A087124 A086326 * A218777 A152799 A140824

Adjacent sequences:  A098698 A098699 A098700 * A098702 A098703 A098704

KEYWORD

nonn,base

AUTHOR

Martin Renner, Oct 27 2004

EXTENSIONS

a(7)-a(31) from David Radcliffe, May 05 2013

STATUS

approved

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Last modified May 20 20:16 EDT 2019. Contains 323426 sequences. (Running on oeis4.)