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%I A134462
%S A134462 11,101,151,1598951,1128512158211,104216919612401,107635959536701
%N A134462 Centered decagonal palindromic primes; or palindromic primes of the form 
               5n^2 + 5n + 1.
%C A134462 a(n) is an intersection of the Palindromic primes = A002385(n) = {2, 
               3, 5, 7, 11, 101, 131, 151, ...} and the Centered 10-gonal numbers 
               = A062786(n) = {1, 11, 31, 61, 101, 151, ...}. Corresponding numbers 
               n such that 5n^2 + 5n + 1 is a term of A134462 are listed in A134463 
               = {1, 4, 5, 565, 475081, ...}. Note that the first 4 terms of A134463 
               are the palindromes.
%H A134462 Eric Weisstein, Link to a section of The World of Mathematics. <a href="http:/
               /mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</
               a>.
%H A134462 Wikipedia: <a href="http://en.wikipedia.org/wiki/Centered_decagonal_number">
               Centered decagonal number</a>.
%t A134462 Do[ f=5k^2+5k+1; If[ PrimeQ[f] && FromDigits[ Reverse[ IntegerDigits[ 
               f ] ] ] == f, Print[ f ] ], {k, 1, 500000} ]
%Y A134462 Cf. A002385 = Palindromic primes. Cf. A062786 = Centered 10-gonal numbers. 
               Cf. A090562 = Primes of the form 5k^2 + 5k + 1. Cf. A090563 = Values 
               of n such that 5n^2 + 5n + 1 is a prime. Cf. A134463 = Values of 
               n such that 5n^2 + 5n + 1 is a palindromic prime.
%Y A134462 Sequence in context: A052035 A083144 A058411 this_sequence A156753 A118592 
               A156617
%Y A134462 Adjacent sequences: A134459 A134460 A134461 this_sequence A134463 A134464 
               A134465
%K A134462 more,nonn,base
%O A134462 1,1
%A A134462 Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 26 2007
%E A134462 More terms from Tomas J. Bulka (tbulka(AT)rodincoil.com), Aug 30 2009

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