A141236 Sequence of k such that starting with P(0)=17 then k(n)*P(n-1)*(k(n)*P(n-1)-1)-1 is the least prime = P(n).

1, 2, 22, 9, 12, 140, 76, 1376, 49, 1030

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Example

1*17*(1*17-1)-1=271 prime so k(1)=1 P(1)=271

Prog

(PARI) P=17; for(i=1, 20, k=0; while(!ispseudoprime(t=k++*P*(k*P-1)-1), ); P=t; print1(k", ")) \\ Charles R Greathouse IV, Dec 27 2011

Crossrefs

Cf. A141233-A141240.

Sequence in context: A083764 A336324 A335886 * A325485 A284063 A153826

Adjacent sequences: A141233 A141234 A141235 * A141237 A141238 A141239

Keyword

nonn

Author

Pierre CAMI, Jun 16 2008

Extensions

a(9)-a(10) from Charles R Greathouse IV, Dec 27 2011

Status

approved