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A178429
Numbers n such that 10^n - 51 is prime.
2
4, 48, 64, 313, 484, 642, 11950, 15845, 18580, 50929
OFFSET
1,1
EXAMPLE
10^4 - 51 = 9949 which is a prime number.
MAPLE
A178429:=n->`if`(isprime(10^n-51), n, NULL): seq(A178429(n), n=1..1000); # Wesley Ivan Hurt, Nov 26 2014
MATHEMATICA
m = 1000; For[n = 1, n < m, If[PrimeQ[10^n - 51], Print[n]]; n++ ]
PROG
(PARI) is(n)=ispseudoprime(10^n-51) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
Sequence in context: A358889 A225987 A377055 * A370417 A242225 A157818
KEYWORD
more,nonn
AUTHOR
Robert Price, Dec 21 2010
EXTENSIONS
a(10) = 50929 found by Robert Price and added by Patrick De Geest, Nov 26 2014
STATUS
approved