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

A098701

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

Terms

    a(0) =3a(1) =6a(2) =15a(3) =39a(4) =90a(5) =209a(6) =457a(7) =991a(8) =2062a(9) =4288a(10) =8521a(11) =17075a(12) =33108a(13) =64073a(14) =121045a(15) =228811a(16) =423188a(17) =781582a(18) =1420445a(19) =2571855a(20) =4599072a(21) =8187723a(22) =14426529a(23) =25278777a(24) =43966808a(25) =75959592a(26) =130496955a(27) =222598065a(28) =378036562a(29) =637128539

External references