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A108420 Numbers n such that n!! + prime(n) is prime. 0

%I

%S 3,14,20,54,56,144,206,212,436,1610,4450,4512,5202,6684

%N Numbers n such that n!! + prime(n) is prime.

%C There is no further term up to 8800. - _Farideh Firoozbakht_, Aug 19 2005

%t Select[Range[1610], PrimeQ[ #!! - Prime[ # ]] &]

%Y Cf. A007749, A064401.

%K nonn

%O 1,1

%A Amineh Farzannia (afarzannia(AT)yahoo.com), Jul 06 2005

%E More terms from _Farideh Firoozbakht_, Aug 19 2005

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Last modified May 10 14:00 EDT 2021. Contains 343770 sequences. (Running on oeis4.)