# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/

Search: id:a082700
Showing 1-1 of 1

%I A082700 #28 Nov 09 2019 03:13:48
%S A082700 5,13,17,19,37,53,73,101,6233,24029,40223,66395
%N A082700 Numbers k such that (15*10^(k-1) - 51)/9 is a plateau prime.
%C A082700 Prime versus probable prime status and proofs are given in the author's table.
%D A082700 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.
%H A082700 Patrick De Geest, <a href="http://www.worldofnumbers.com/deplat.htm#pdp161">PDP Reference Table - 161</a>.
%H A082700 Makoto Kamada, <a href="https://stdkmd.net/nrr/1/16661.htm#prime">Prime numbers of the form 166...661</a>.
%H A082700 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.
%F A082700 a(n) = A056247(n+1) + 2.
%e A082700 k=13 -> (15*10^(13-1) - 51)/9 = 1666666666661.
%o A082700 (PARI) is(n)=ispseudoprime(2*(10^n-1)/3-5*(10^(n-1)+1)) || ispseudoprime(15*10^(n-1)-51)/9 \\ _Charles R Greathouse IV_, Feb 07 2013
%Y A082700 Cf. A056247, A068647, A082697-A082720.
%K A082700 nonn,base,more
%O A082700 1,1
%A A082700 _Patrick De Geest_, Apr 13 2003
%E A082700 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
%E A082700 Edited by _Ray Chandler_, Nov 04 2014

# Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE