A110066 Numbers n such that 10^n - prime(n) is prime.

2, 5, 40, 69, 586, 927, 1393, 11411, 32741, 79040

Offset: 1

Author

Farideh Firoozbakht, Jul 12 2005

Keywords

• more
• nonn

Comments

There is no further term up to 10800.

a(11) > 10^5. - Robert Price, Feb 26 2015

Crossrefs

Cf. A110065, A110067.

Programs

Mathematica

Do[If[PrimeQ[10^n - Prime[n]], Print[n]], {n, 10800}]

PARI

is(n)=ispseudoprime(10^n-prime(n)) \\ Charles R Greathouse IV, May 15 2013

Extensions

a(8)-a(10) from Robert Price, Feb 26 2015