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A062214 Numbers k such that the smoothly undulating palindromic number(18*10^k - 81)/99 is a prime. 0

%I

%S 3,5,77,163,1479,3657,4573,8315,30259,31063,31855,36915,66657

%N Numbers k such that the smoothly undulating palindromic number(18*10^k - 81)/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="http://www.worldofnumbers.com/undulat.htm#supp181">SUPP Reference Table - 181</a>

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

%e k=5 -> (18*10^5 - 81)/99 = 18181.

%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 a(13)=66657 from _Ray Chandler_, Jan 31 2011

%E Edited by _Ray Chandler_, Aug 17 2011

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Last modified July 30 19:33 EDT 2021. Contains 346359 sequences. (Running on oeis4.)