References to A007770

Happy numbers: numbers whose trajectory under iteration of sum of squares of digits map includes 1.
1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109


1 seqfan posts

Mon Sep 26 18:28:28 CEST 2011    [seqfan] Re: broken links to pages from W. Schneider

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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