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Table of n, a(n) for n=1..56.
If n=154 then 5*n^2 + 9 = 118589 (prime).
Select[Range, PrimeQ[5*#^2 + 9] &] (* Stefan Steinerberger, Feb 26 2006 *)
Sequence in context: A039682 A218665 A189558 * A123689 A137928 A144834
Adjacent sequences: A111146 A111147 A111148 * A111150 A111151 A111152
Parthasarathy Nambi, Oct 18 2005
More terms from Stefan Steinerberger, Feb 26 2006