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A177465 Primes of the form (35*10^n-71)/9 0
31, 3881, 38888888888888888881, 3888888888888888888888888888881, 38888888888888888888888888888888888888881, 3888888888888888888888888888888888888888881, 3888888888888888888888888888888888888888888881 (list; graph; refs; listen; history; text; internal format)
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: A072913 A001237 A289397 * A187755 A115736 A110848

Adjacent sequences:  A177462 A177463 A177464 * A177466 A177467 A177468

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Dec 11 2010

STATUS

approved

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Last modified October 22 05:36 EDT 2021. Contains 348160 sequences. (Running on oeis4.)