Hello seqfans and math-fun, I've just published A101246 in Sloane's OEIS (see below). Could someone calculate for me the last term of the sequence (which, I'm sure, is finite) ? best, E. -------- 1,3,7,605,607,1446,1538,1608,2545,2618,3027,4616,4903, (...) « Insert the first differences between every pair of integers; this new sequence has it's first 10 digits all different one from another ; and so for the next 10 ; and for the next 10, etc. To construct the above sequence, start with 1 and add the smallest available integer which doesn't lead to a contradiction. » Example : 1 3 7 605 607 1446 1538 1608 2545 2618 (seq. A101246) 2 4 598 2 839 92 70 937 73 409 (first differ.) **10*dig**--10-dig--**10*dig**--10-dig--**10-dig** (10 digit boxes)