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a(n) is congruent 3 mod 4.
Primes of the form 2x^2+10x-5, x>=1. [From R. J. Mathar and Vincenzo Librandi, Apr 21 2010]
Table of n, a(n) for n=1..41.
Sequence in context: A031095 A319050 A031371 * A000353 A097149 A185007
Adjacent sequences: A176554 A176555 A176556 * A176558 A176559 A176560
Giovanni Teofilatto, Apr 20 2010
More terms from R. J. Mathar and Vincenzo Librandi, Apr 21 2010