A037910 Number of i such that |d(i) - d(i-1)| = 1, where Sum_{i=0..m} d(i)*7^i is the base-7 representation of n.

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

Offset

1,50

Links

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

Prog

(PARI) a(n) = my(c); for(i=2, #n=digits(n, 7), 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), A037908 (b=5), A037909 (b=6), A037911 (b=8), A037912 (b=9), A037913 (b=10).

Sequence in context: A037820 A076493 A278907 * A162781 A056975 A370482

Adjacent sequences: A037907 A037908 A037909 * A037911 A037912 A037913

Keyword

nonn,base

Author

Clark Kimberling

Status

approved