a(1) = 8127; thereafter a(n) = (a(n-1) with digits sorted into descending order) - (a(n-1) with digits sorted into ascending order) (see the Kaprekar map, A151949).
8127, 7443, 3996, 6264, 4176, 6174, 6174, 6174, 6174, 6174, 6174, 6174, 6174
3 seqfan posts
Wed Aug 19 21:56:33 CEST 2009 [seqfan] Re: help needed with sequences related to Kaprekar map