a(n) = difference between the n-th composite number and the sum of its prime factors with repetition.
0, 1, 2, 3, 3, 5, 5, 7, 8, 10, 11, 11, 9, 15, 15, 11, 18, 17, 20, 22, 19, 15, 23, 26, 17, 23
2 seqfan posts
Fri Oct 31 20:49:55 CET 2008 [seqfan] Re: Sieving method for composite numbers described / used in A146071