A062217 - OEIS

%I #19 Aug 11 2024 14:41:34

%S 5,9,11,3015,3407,6959,9599,11399,16593,25883

%N Numbers k such that the smoothly undulating palindromic number (32*10^k - 23)/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#supp323">SUPP Reference Table - 323</a>

%H Alexandre Zalesski, <a href="https://arxiv.org/abs/2401.16075">Unisingular subgroups of symplectic group Sp_2n(2) for 2n < 250</a>, arXiv:2401.16075 [math.GR], 2024. See pp. 15, 52.

%H <a href="/index/Pri#pri_supp">Index entries for sequences related to smoothly undulating palindromic primes</a>

%e k=11 -> (32*10^11 - 23)/99 = 32323232323.

%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 Edited by _Ray Chandler_, Aug 17 2011