99*a(n)^2 + 1 is a square.
0, 1, 20, 399, 7960, 158801, 3168060, 63202399, 1260879920, 25154396001
2 seqfan posts
Fri Dec 11 20:40:43 CET 2009 [seqfan] Divisibility sequences in OEIS.
Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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