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A171704 The first n-fold intrinsically 5-palindrome (represented in base ten). 25
17, 2293, 267140, 4838419019 (list; graph; refs; listen; history; text; internal format)



The fourth term, which is first 5-palindromic in base 91, is almost a concatenation of base-ten 5-palindromes.

A217146 gives the sequence of values 5-palindromic in at least 4 bases.  The search there indicates a fifth term here has first base of 5-palindromicity above 200. - James G. Merickel Oct 19 2012

a(5) > 10^14. - Hiroaki Yamanouchi, Aug 22 2015


Table of n, a(n) for n=1..4.


a(2)=2293 is 33133 in base 5 and 14341 in base 6;

a(3)=267140 is 6D4D6, 54245 and 29E92 in bases 14, 15 and 18, respectively.


Cf. A171701, A171702, A171703, A171705, A171706, A171740, A171741, A171742 A217146.

Sequence in context: A001905 A221322 A135505 * A198288 A092814 A198594

Adjacent sequences:  A171701 A171702 A171703 * A171705 A171706 A171707




James G. Merickel, Dec 17 2009



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Last modified December 9 03:27 EST 2019. Contains 329872 sequences. (Running on oeis4.)