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 A216901 Smallest palindromic number of 7 digits in two bases differing by n. 16
 186621, 532900, 1857351, 9046409, 17439233, 69012421, 146766357, 289744476, 347411351, 390219121, 1200809057, 1393838392, 3088676989, 2383346701, 3333147809, 6041072349, 6819663132, 7822398453, 9534770061, 12359264257, 18701296795, 20196246357, 25763014657 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See comments to A216840 and A216841.  Smaller of pair of bases are 6, 7, 8, 10, 11, 14, 15, 17, 17, 17.  The A216*** cross-references here are other sequences of this collection, while the A171*** ones are to various multi-base record palindromes. LINKS Chai Wah Wu, Table of n, a(n) for n = 1..100 EXAMPLE 9046409 is also a 7-digit palindrome in base 14 (in addition to decimal).  No smaller number is a 7-digit palindrome in both of two bases that differ by 4. CROSSREFS Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216900, A216902, A216903, A216904, A216905, A216906, A216907, A216908, A216909, A216910. Sequence in context: A186878 A192103 A203442 * A253293 A253163 A185775 Adjacent sequences:  A216898 A216899 A216900 * A216902 A216903 A216904 KEYWORD nonn,base AUTHOR James G. Merickel, Sep 19 2012 EXTENSIONS More terms from Chai Wah Wu, Aug 16 2015 STATUS approved

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Last modified December 16 04:05 EST 2019. Contains 330013 sequences. (Running on oeis4.)