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A173852 Primes of the form 10^n - 2^n - 1. 2
7, 991, 999999487, 999999999967231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term is too large to display here.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..6

MATHEMATICA

Select[Table[10^n-2^n-1, {n, 0, 100}], PrimeQ] (* Vincenzo Librandi, Jul 26 2012 *)

PROG

(MAGMA) /* The code gives only the terms up to a(5): */ [a: n in [0..200] | IsPrime(a) where a is 10^n-2^n-1]; // Vincenzo Librandi, Jul 26 2012

CROSSREFS

Cf. A174179.

Sequence in context: A286913 A201070 A213960 * A062841 A110718 A293142

Adjacent sequences:  A173849 A173850 A173851 * A173853 A173854 A173855

KEYWORD

nonn,hard

AUTHOR

Vincenzo Librandi, Feb 26 2010

STATUS

approved

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Last modified January 24 16:34 EST 2020. Contains 331207 sequences. (Running on oeis4.)