Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Jan 03 2022 21:08:50
%S 691,887,1997,3583,3673,3853,3943,4079,4259,4349,4799,4889,5581,5851,
%T 6257,6977,8089,8179,8269,8539,8629,8719,10663,10883,11777,11833,
%U 11867,11923,11953,11959,12097,12763,12823,13397,13523,13553,13597,13633
%N Primes in A023108(n); or Lychrel primes.
%C A023108(n) = Positive integers which apparently never result in a palindrome under repeated applications of the function f(x) = x + (x with digits reversed).
%e A023108(n) begins {196, 295, 394, 493, 592, 689, 691, 788, 790, 879, 887, ...}.
%e Thus a(1) = 691 which is the first prime in A023108(n), a(2) = 887 which is the second prime in A023108(n).
%Y Cf. A023108, A088753.
%K nonn,base
%O 1,1
%A _Alexander Adamchuk_, Dec 05 2007
%E More terms from _Dmitry Kamenetsky_, May 04 2009