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A242407

Numbers such that in ternary representation all pairs of adjacent digits have sums not greater than 2.

0, 1, 2, 3, 4, 6, 9, 10, 11, 12, 13, 18, 19, 20, 27, 28, 29, 30, 31, 33, 36, 37, 38, 39, 40, 54, 55, 56, 57, 58, 60, 81, 82, 83, 84, 85, 87, 90, 91, 92, 93, 94, 99, 100, 101, 108, 109, 110, 111, 112, 114, 117, 118, 119, 120, 121, 162, 163, 164, 165, 166, 168

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OFFSET

1,3

COMMENTS

A242400(a(n)) = 0;

A242399(a(n)) = 4*a(n);

numbers m, such that in ternary arithmetic no carry occurs, when 3*m is added to m.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Ternary.

Wikipedia, Ternary numeral system

EXAMPLE