

A118129


Numbers k such that the sum of the first k odd composites is palindromic in base 3.


1



6, 14, 20, 424, 1042, 8290, 20802, 21644, 440512, 548008, 749171, 4366390, 5378548, 9850174, 17930596, 36158854, 130427194, 407305710, 3077094752, 93416875260
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OFFSET

1,1


COMMENTS

No more terms through 10^9.


LINKS



EXAMPLE

The sum of the first 14 odd composites, when written in base 3, is the palindrome 201102, so 14 is in the sequence.


CROSSREFS

Cf. A058848 (palindromic in base 10).


KEYWORD

nonn,base,hard,more


AUTHOR



EXTENSIONS



STATUS

approved



