a(n) = (sum of digits of n) + (product of digits of n).
0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 2, 5, 8, 11, 14, 17, 20
1 seqfan posts
Sun Oct 10 14:05:23 CEST 2010 [seqfan] Verifying A074871, iteration of sum-of-digits(n)+product-of-digits(n)