A229902 a(n) is the smallest m such that 19*m^k+1 is prime for k=1, 2,...,n.

10, 10, 10, 2080, 178030, 41697270, 4355942080, 1944616927560

Offset

1,1

Comments

10 divides all terms.

Links

Table of n, a(n) for n=1..8.

Mathematica

a[1]=10; a[n_]:=a[n]=(For[m=a[n-1]/10, Union[Table[PrimeQ[19(10m)^k+1], {k, n}]]=={True}, m++]; 10m) (* Farideh Firoozbakht Oct 05 2013 *)

Crossrefs

Cf. A106759, A166459, A229906, A229626.

Sequence in context: A003855 A245431 A341722 * A004209 A162720 A112867

Adjacent sequences: A229899 A229900 A229901 * A229903 A229904 A229905

Keyword

nonn,more

Author

Jahangeer Kholdi, Oct 04 2013

Extensions

a(7) from Farideh Firoozbakht Oct 05 2013

a(8) from Tyler Busby, Jan 06 2023

Status

approved