A321767 Reverse runs of nonzero digits in ternary expansion of n and convert back to decimal.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 12, 13, 14, 15, 16, 17, 18, 11, 20, 21, 22, 23, 24, 25, 26, 27, 28, 55, 30, 37, 46, 57, 64, 73, 36, 31, 58, 39, 40, 41, 42, 43, 44, 45, 32, 59, 48, 49, 50, 51, 52, 53, 54, 29, 56, 33, 38, 47, 60, 65, 74, 63, 34, 61, 66, 67
Offset: 0
Examples
For n = 11111: - the ternary representation of 11111 is "120020112", - we have three runs of nonzero digits: "12", "2" and "112", - we replace the first by the third, the third by the first and the second remains in place, - the result is: "112002012", - and a(11111) = 10265.
Links
Crossrefs
See A321726 for a similar sequence.
Programs
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PARI
See Links section.
Formula
a(3 * n) = 3 * a(n).
Comments