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

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

Offset

1,1

Comments

There is no further term up to 10800.

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

Links

Table of n, a(n) for n=1..10.

Mathematica

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

Prog

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

Crossrefs

Cf. A110065, A110067.

Sequence in context: A307141 A109003 A120031 * A155176 A127974 A012801

Adjacent sequences: A110063 A110064 A110065 * A110067 A110068 A110069

Keyword

more,nonn

Author

Farideh Firoozbakht, Jul 12 2005

Extensions

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

Status

approved