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A104994 Least k(n)>1 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 or 0 if n=4 as no prime possible. 1
2, 2, 2, 0, 2, 2, 2, 3, 3, 6, 6, 7, 8, 8, 12, 14, 14, 19, 21, 21, 22, 27, 27, 28, 29, 29, 30, 30, 34, 37, 38, 39, 39, 41, 41, 43, 50, 52, 54, 54, 56 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

sequence of the primes given in A104995

LINKS

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

EXAMPLE

1*2^2+1*2+1=7 prime so k(1)=2

2*2^2+2*2+1=13 prime > 7 so k(2)=2

3*2^2+3*2+1=19 prime > 13 so k(3)=2

5*2^2+5*2+1=31 prime > 19 so k(5)=2

CROSSREFS

Cf. A104995.

Sequence in context: A307521 A328995 A036476 * A118664 A223175 A322213

Adjacent sequences:  A104991 A104992 A104993 * A104995 A104996 A104997

KEYWORD

nonn

AUTHOR

Pierre CAMI, Mar 31 2005

STATUS

approved

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Last modified September 27 22:36 EDT 2020. Contains 337388 sequences. (Running on oeis4.)