%I #17 Aug 11 2024 14:41:34
%S 3,51,83,225,561,10419,18255,43869
%N Numbers k such that the smoothly undulating palindromic number (31*10^k - 13)/99 is a prime.
%C Prime versus probable prime status and proofs are given in the author's table.
%C No further terms < 100000. - _Ray Chandler_, Aug 17 2011
%H P. De Geest, <a href="https://www.worldofnumbers.com/undulat.htm#supp313">SUPP Reference Table - 313</a>
%H <a href="/index/Pri#pri_supp">Index entries for sequences related to smoothly undulating palindromic primes</a>
%e k=51 -> (31*10^51 - 13)/99 = 313131313131313131313131313131313131313131313131313.
%Y Cf. A062209-A062232, A059758, A032758.
%K nonn,base
%O 1,1
%A _Patrick De Geest_ and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001
%E 43869 from _Ray Chandler_, Sep 30 2010
%E Edited by _Ray Chandler_, Aug 17 2011