login
A174352
Numbers n such that (n+1)*10^n - 1 is prime.
3
1, 4, 5, 17, 20, 28, 173, 181, 331, 575, 1313, 1754, 4067, 27314
OFFSET
1,2
COMMENTS
The corresponding primes are in A145851. Primes found and proved by PrimeForm. No more terms up to 30000.
PROG
(PARI) is(n)=ispseudoprime((n+1)*10^n-1) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
Cf. A145851.
Sequence in context: A258063 A344061 A045680 * A152021 A026678 A026869
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Mar 22 2010
STATUS
approved