A154665 Numbers n such that n!^2-+8663 are primes.

3, 4, 5, 6, 40

Offset

1,1

Comments

Next term is larger than 72

a(6) > 1000 (if it exists) - Robert Price, Mar 26 2019

Links

Table of n, a(n) for n=1..5.

Mathematica

lst={}; a=8663; Do[If[PrimeQ[n!^2-a]&&PrimeQ[n!^2+a], AppendTo[lst, n]], {n, 3*4!}]; lst

Crossrefs

Cf. A144046, A154660, A154661, A154662, A154663, A154664

Sequence in context: A083401 A281829 A083400 * A056190 A202702 A049465

Adjacent sequences: A154662 A154663 A154664 * A154666 A154667 A154668

Keyword

nonn,more

Author

Vladimir Joseph Stephan Orlovsky, Jan 13 2009

Status

approved