[ahem] My former post could be seen as a particular case of < a(n) divides [a(n+1)+(n+k)] > with k=1. Here is the case for k=2: H=1,2,4,3,6,5,7,12,14,17,22,9,13,11,28,39,21,23,26,... (done by hand, 40 min before midnight) If this is of interest, the seq computed with k=1 to 10 could be entered. Best, É. (now in bed) Catapulté de mon aPhone