A178438 Numbers n such that 10^n - 83 is prime.

2, 6, 16, 42, 47, 62, 109, 191, 221, 509, 3671, 4229, 4886, 6967, 12086

Offset

1,1

Comments

The next term, if one exists, is > 100000. - Robert Price, Apr 25 2011

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99917".

Links

Table of n, a(n) for n=1..15.

Makoto Kamada, List of near-repdigit-related prime numbers

Index entries for primes involving repunits

Example

10^6 - 83 = 999917 which is a prime number.

Mathematica

nMax=1000; Do[If[PrimeQ[10^n-83], Print[n]], {n, nMax}]

Prog

(PARI) is(n)=ispseudoprime(10^n-83) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A108330, A108328.

Sequence in context: A276359 A158920 A263592 * A365548 A143123 A102699

Adjacent sequences: A178435 A178436 A178437 * A178439 A178440 A178441

Keyword

more,nonn

Author

Robert Price, Dec 21 2010

Extensions

Example corrected by Patrick De Geest, Nov 28 2014

Status

approved