Kaprekar numbers, allowing powers of 10: n such that n=q+r and n^2=q*10^m+r, for some m >= 1, q>=0 and 0<=r<10^m.
1, 9, 10, 45, 55, 99, 100, 297, 703, 999, 1000, 2223, 2728, 4950, 5050, 7272, 7777
1 seqfan posts
Fri Aug 19 23:30:57 CEST 2011 [seqfan] Re: Is 0001 a 4-digit base 10 number ?