1,3

Remaining terms are greater than 1000.

n=5 is here because 4*5!-1=479 is prime.

for n from 0 to 1000 do if isprime(4*n! - 1) then print(n) end if end do;

Cf. A076680.

Sequence in context: A053436 A057546 A138587 this_sequence A008627 A027593 A007211

Adjacent sequences: A099347 A099348 A099349 this_sequence A099351 A099352 A099353

nonn

Brian Kell (abodeman(AT)yahoo.com), Oct 12 2004