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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
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: A201070 A332197 A213960 * A062841 A349736 A110718
KEYWORD
nonn,hard
AUTHOR
Vincenzo Librandi, Feb 26 2010
STATUS
approved

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Last modified June 18 23:49 EDT 2024. Contains 373490 sequences. (Running on oeis4.)