|
%I #19 Jan 17 2019 13:44:08
%S 1,2,8,11,145,695,1099,3518,6211,13015
%N Integers n such that 10^n + 73 is a prime number.
%C a(5) to a(7) were certified prime with PRIMO. - _Bernardo Boncompagni_, Nov 07 2008
%C The next term (if one exists) is > 100000. - _Robert Price_, Apr 25 2011
%C See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10073".
%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 10^8+73 = 100000000+73 = 100000073, which is prime.
%t Select[Range[1000], PrimeQ[10^# + 73] &] (* _G. C. Greubel_, Sep 28 2016 *)
%Y Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.
%K more,nonn
%O 1,2
%A Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008
%E a(7) from _Bernardo Boncompagni_, Nov 07 2008
%E Added term 13015. _Robert Price_, Mar 22 2010
%E Added two terms: 3518,6211. _Robert Price_, Oct 10 2010
%E Edited by _Ray Chandler_, Dec 23 2010
| 