A037906 Number of i such that |d(i) - d(i-1)| = 1, where Sum_{i=0..m} d(i)*3^i is the base-3 representation of n.

0, 0, 1, 0, 1, 0, 1, 0, 1, 2, 1, 1, 0, 1, 1, 2, 1, 0, 1, 0, 2, 1, 2, 0, 1, 0, 1, 2, 1, 3, 2, 3, 1, 2, 1, 1, 2, 1, 1, 0, 1, 1, 2, 1, 1, 2, 1, 3, 2, 3, 1, 2, 1, 0, 1, 0, 2, 1, 2, 0, 1, 0, 2, 3, 2, 2, 1, 2, 2, 3, 2, 0, 1, 0, 2, 1, 2, 0, 1, 0, 1, 2, 1, 3, 2, 3, 1, 2, 1, 3

Offset

1,10

Links

Iain Fox, Table of n, a(n) for n = 1..10000

Prog

(PARI) a(n) = my(c); for(i=2, #n=digits(n, 3), if(abs(n[i]-n[i-1])==1, c++)); c \\ Iain Fox, Oct 27 2018

Crossrefs

In base b: A037907 (b=4), A037908 (b=5), A037909 (b=6), A037910 (b=7), A037911 (b=8), A037912 (b=9), A037913 (b=10).

Sequence in context: A257988 A340379 A075685 * A319394 A278347 A120936

Adjacent sequences: A037903 A037904 A037905 * A037907 A037908 A037909

Keyword

nonn,base

Author

Clark Kimberling

Status

approved