Successive sequences whose numbers and their differences of increasing rank include all numbers (generalisation of A005228).
1, 1, 3, 1, 3, 7, 12, 1, 3, 7, 15, 18, 1, 3, 7, 15, 28, 26, 1, 3, 7, 15, 31, 47, 35, 1, 3, 7, 15
2 seqfan posts
Sat Jan 17 21:14:44 CET 2009 [seqfan] Re: help needed in editing A139123