A037908 Number of i such that |d(i) - d(i-1)| = 1, where Sum_{i=0..m} d(i)*5^i is the base-5 representation of n.

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

Offset

1,26

Links

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

Prog

(PARI) a(n) = my(c); for(i=2, #n=digits(n, 5), if(abs(n[i]-n[i-1])==1, c++)); c \\ Iain Fox, Oct 27 2018

Crossrefs

In base b: A037906 (b=3), A037907 (b=4), A037909 (b=6), A037910 (b=7), A037911 (b=8), A037912 (b=9), A037913 (b=10).

Sequence in context: A238450 A251926 A335504 * A116663 A258940 A340607

Adjacent sequences: A037905 A037906 A037907 * A037909 A037910 A037911

Keyword

nonn,base

Author

Clark Kimberling

Status

approved