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

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

Offset

1,1

Comments

There is no further term up to 8800. - Farideh Firoozbakht, Aug 19 2005

Links

Table of n, a(n) for n=1..14.

Mathematica

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

Crossrefs

Cf. A007749, A064401.

Sequence in context: A063633 A108933 A271384 * A015639 A019000 A305090

Adjacent sequences: A108417 A108418 A108419 * A108421 A108422 A108423

Keyword

nonn

Author

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

Extensions

More terms from Farideh Firoozbakht, Aug 19 2005

Status

approved