

A062943


When expressed in base 7 and then interpreted in base 9, is a multiple of the original number.


2



0, 1, 2, 3, 4, 5, 6, 426, 428, 452, 880, 906, 932, 1360, 7687134, 53809938, 2571412221, 2582875882, 5016909933, 5154289245, 7736157463, 7748731389, 39728612701, 109634280128, 116779253264, 198109784526, 233617301990, 480974817878, 1011847148845, 1432434922737
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OFFSET

1,3


COMMENTS

The terms I added (including those in the bfile) are all the remaining ones < 10^30. They have been computed by essentially using ideas from Giovanni Resta.  Dimiter Skordev, Jan 26 2020


LINKS

Dimiter Skordev, Table of n, a(n) for n = 1..103
Dimiter Skordev, Python script


EXAMPLE

426 in base 7 is 1146, which interpreted in base 9 is 852=2*426.


MATHEMATICA

Join[{0}, Select[Range[1400], Divisible[FromDigits[IntegerDigits[#, 7], 9], #]&]] (* Harvey P. Dale, Mar 29 2012 *)


CROSSREFS

Cf. A032549.
Sequence in context: A073788 A326315 A004879 * A004890 A153678 A004901
Adjacent sequences: A062940 A062941 A062942 * A062944 A062945 A062946


KEYWORD

base,nonn


AUTHOR

Erich Friedman, Jul 21 2001


EXTENSIONS

More terms from Naohiro Nomoto, Aug 07 2001
a(16) and beyond from Dimiter Skordev, Jan 25 2020


STATUS

approved



