

A216907


Smallest palindromic number of length 13 in two bases differing by n.


15



318713056300, 101252880671531, 778061547945037, 8047782883062742, 37866346844745025, 247644110790746909, 828823170233185174, 10556938000726441969, 10175119610486126649, 34575397981277771773, 91506808775956056797
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OFFSET

1,1


COMMENTS

See comments sections of A216840 and A216841. Smallest of pair of bases are 8, 12, 14, 17, 19, 22, 24, 30, 32. For the remarkable case a(10), not only does the number have four 7s in a row in base 10, but it also has prime reversal there and in its 2nd base of 13palindromicity, 42, no digit larger than 20 appears. A216*** crossreferences are others in a collection of sequences that includes this one, while A171*** ones are various record multibase palindromes.


LINKS



EXAMPLE

The first term is 4506461646054 in base 8 and 1113578753111 in base 9.


CROSSREFS

Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216900, A216901, A216902, A216903, A216904, A216905, A216906, A216908, A216909, A216910.


KEYWORD

nonn,base


AUTHOR



EXTENSIONS



STATUS

approved



