A104995 Smallest prime such that n*k(n)^2+n*k(n)+1 is a prime > (n-1)*k(n-1)^2+(n-1)*k(n-1)+1 with k(n)>1 or 0 if n=4 as no prime possible.

7, 13, 19, 0, 31, 37, 43, 97, 109, 421, 463, 673, 937, 1009, 2341, 3361, 3571, 6841, 8779, 9241, 10627, 16633, 17389, 19489, 21751, 22621, 25111, 26041, 34511, 42181, 45943, 49921, 51481, 58549, 60271, 68113, 94351, 104729, 115831, 118801, 130873

Offset

1,1

Comments

sequence of k(n) given in A104994

Links

Table of n, a(n) for n=1..41.

Example

1*2^2+1*2+1=7 prime with k(1)=2
2*2^2+2*2+1=13 prime > 7 with k(2)=2
3*2^2+3*2+1=19 prime > 13 with k(3)=2
5*2^2+5*2+1=31 prime > 19 with k(5)=2

Crossrefs

Cf. A104994.

Sequence in context: A352422 A212454 A266731 * A107744 A254762 A275681

Adjacent sequences: A104992 A104993 A104994 * A104996 A104997 A104998

Keyword

nonn

Author

Pierre CAMI, Mar 31 2005

Status

approved