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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. 8
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,50
LINKS
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 A294079
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)