A154526 Primes p such that lcm(1,2,3,...,p-2,p-1,p) -+ 1 are both primes.

3, 5, 7, 19, 47

Offset

1,1

Comments

Intersection of A154524 and A154525.

Links

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

Prog

(PARI) isok(p) = {if (! isprime(p), return (0)); lcmv = lcm(vector(p, i, i)); isprime(lcmv + 1) && isprime(lcmv - 1); } \\ Michel Marcus, Oct 26 2013

Crossrefs

Cf. A056604, A154524, A154525.

Sequence in context: A005850 A052334 A322302 * A126144 A171643 A072002

Adjacent sequences: A154523 A154524 A154525 * A154527 A154528 A154529

Keyword

more,nonn

Author

Lekraj Beedassy, Jan 11 2009

Status

approved