1,3

n=5 is here because 3*5!-1=359 is a prime.

for n from 0 to 1000 do if isprime(3*n! - 1) then print(n) end if end do;

Cf. A051915, A076134.

Sequence in context: A084542 A038201 A033084 this_sequence A101526 A140298 A107365

Adjacent sequences: A076131 A076132 A076133 this_sequence A076135 A076136 A076137

nonn

Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 30 2002