A141234 Sequence of k such that starting with P(0)=11 then k(n)*P(n-1)*(k(n)*P(n-1)-1)-1 is the least prime = P(n).

1, 5, 3, 11, 74, 93, 139, 511, 641, 1166

Offset

1,2

Links

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

Example

1*11*(1*11-1)-1=109 is a prime so k(1)=1 P(1)=109.

Prog

(PARI) P=11; for(i=1, 20, k=0; while(!ispseudoprime(t=k++*P*(k*P-1)-1), ); P=t; print1(k", ")) \\ Michel Marcus, Sep 16 2019 ; after A141240

Crossrefs

Cf. A141233, A141235, A141236, A141237, A141238, A141239, A141240.

Sequence in context: A165670 A221869 A237116 * A130180 A245288 A104587

Adjacent sequences: A141231 A141232 A141233 * A141235 A141236 A141237

Keyword

nonn,more

Author

Pierre CAMI, Jun 16 2008

Extensions

a(9) from Michel Marcus, Sep 17 2019

a(10) from Jinyuan Wang, Sep 17 2019

Status

approved