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A177440 Primes of the form (8*10^n + 7)/3. 1
5, 29, 269, 26669, 26666669, 266666666666669, 266666666666666666669, 2666666666666666666666666666666666666669 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(12) has 1191 digits. - Vincenzo Librandi, Jan 03 2014

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..11

MATHEMATICA

Select[Table[(8 10^n + 7)/3, {n, 0, 300}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)

PROG

(MAGMA) [a: n in [0..250] | IsPrime(a) where a is (8*10^n+7)div(3)]

CROSSREFS

Cf. A102957.

Sequence in context: A326986 A228387 A181356 * A292567 A332517 A332469

Adjacent sequences:  A177437 A177438 A177439 * A177441 A177442 A177443

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Dec 11 2010

STATUS

approved

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Last modified July 29 01:11 EDT 2021. Contains 346340 sequences. (Running on oeis4.)