A177465 Primes of the form (35*10^k-71)/9.

31, 3881, 38888888888888888881, 3888888888888888888888888888881, 38888888888888888888888888888888888888881, 3888888888888888888888888888888888888888881, 3888888888888888888888888888888888888888888881

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Mathematica

Select[Table[10 FromDigits[PadRight[{3}, n, 8]]+1, {n, 50}], PrimeQ] (* Harvey P. Dale, Jul 02 2021 *)

Prog

(Magma) [a: n in [0..250]|IsPrime(a) where a is (35*10^n-71)div(9)];

Crossrefs

Cf. A102978

Sequence in context: A001237 A289397 A389801 * A187755 A351133 A350721

Adjacent sequences: A177462 A177463 A177464 * A177466 A177467 A177468

Keyword

nonn

Author

Vincenzo Librandi, Dec 11 2010

Status

approved