A216901 Smallest palindromic number of 7 digits in two bases differing by n.

186621, 532900, 1857351, 9046409, 17439233, 69012421, 146766357, 289744476, 347411351, 390219121, 1200809057, 1393838392, 3088676989, 2383346701, 3333147809, 6041072349, 6819663132, 7822398453, 9534770061, 12359264257, 18701296795, 20196246357, 25763014657

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