Numbers n such that any group of n consecutive integers has integral standard deviation {viz. A011944(n)}.
1, 7, 97, 1351, 18817, 262087, 3650401, 50843527, 708158977, 9863382151
1 seqfan posts
Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences