A098701 Number of solutions to rev(x^2) = rev(x)^2 with n digits, where the rev(x) function reverses the digits of x.

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

Offset

1,1

Comments

Excludes multiples of 10.

Links

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

Crossrefs

Cf. A085305.

Sequence in context: A087124 A327647 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