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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The corresponding primes are in A145851. Primes found and proved by PrimeForm. No more terms up to 30000.

LINKS

Table of n, a(n) for n=1..14.

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

Adjacent sequences:  A174349 A174350 A174351 * A174353 A174354 A174355

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Mar 22 2010

STATUS

approved

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Last modified June 20 03:20 EDT 2021. Contains 345157 sequences. (Running on oeis4.)