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A108506 Integers n such that 10^n-59 is prime. 4

%I #23 Jan 17 2019 13:44:08

%S 2,3,4,8,20,38,95,248,263,303,304,410,438,548,688,1074,1575,8364,9910,

%T 15910,37344

%N Integers n such that 10^n-59 is prime.

%C Certified primality of numbers corresponding to terms 410, 438, 548, 688, 1074 and 1575 with Primo. - _Ryan Propper_, Jul 08 2005

%C No other terms <40000.

%C See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99941".

%H Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>.

%H <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.

%e 8 is a member because: n = 8 gives 10^8-59 = 100000000-59 = 99999941, which is prime.

%Y Cf. A089675, A095714, A092767, A108327, A108328, A108329, A108330, A108331, A108332, A177418.

%K more,nonn

%O 1,1

%A Julien Peter Benney (jpbenney(AT)ftml.net), Jul 06 2005

%E a(18)-a(20) from Kamada data by _Robert Price_, Dec 10 2010

%E a(21) by _Robert Price_, Dec 16 2010

%E Edited by _Ray Chandler_, Dec 23 2010

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)