A261620 - OEIS

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A261620

Numbers n such that 10^(n-1) - pi(n) is prime.

%I #26 Sep 21 2015 20:40:04

%S 31,536,2684,7795,8482,49009,96339,236060

%N Numbers n such that 10^(n-1) - pi(n) is prime.

%C a(9) > 260843.

%t Select[Range[50000], PrimeQ[10^(# - 1) - PrimePi[#]] &]

%o (PARI) is(n) = ispseudoprime(10^(n-1) - primepi(n)) \\ _Michel Marcus_, Sep 10 2015

%Y Cf. A110068.

%K more,nonn

%O 1,1

%A _Robert Price_, Sep 09 2015

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Last modified December 11 08:46 EST 2023. Contains 367722 sequences. (Running on oeis4.)