A037911 Number of i such that |d(i) - d(i-1)| = 1, where Sum_{i=0..m} d(i)*8^i is the base-8 representation of n.

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

Offset

1,65

Links

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

Prog

(PARI) a(n) = my(c); for(i=2, #n=digits(n, 8), if(abs(n[i]-n[i-1])==1, c++)); c \\ Iain Fox, Oct 28 2018

Crossrefs

In base b: A037906 (b=3), A037907 (b=4), A037908 (b=5), A037909 (b=6), A037910 (b=7), A037912 (b=9), A037913 (b=10).

Sequence in context: A025920 A037821 A316863 * A176046 A172090 A037912

Adjacent sequences: A037908 A037909 A037910 * A037912 A037913 A037914

Keyword

nonn,base

Author

Clark Kimberling

Status

approved