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

Author

Robert Price, Dec 21 2010

Keywords

• more
• nonn

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".

Examples

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

Links

• Makoto Kamada, List of near-repdigit-related prime numbers
• Index entries for primes involving repunits

Crossrefs

Cf. A108330, A108328.

Programs

Mathematica

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

PARI

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

Extensions

Example corrected by Patrick De Geest, Nov 28 2014