OFFSET
1
COMMENTS
Sum of Möbius function values computed for terms of 3x+1 trajectory started at n, but excluding mu(n) itself. See Marc LeBrun's comment in A087003.
LINKS
FORMULA
PROG
(PARI)
A292273(n) = if(n%2, 0, -moebius(n)); \\ After the definition.
\\ Implementation following the Collatz-interpretation:
A006370(n) = if(n%2, 3*n+1, n/2); \\ This function from Michael B. Porter, May 29 2010
\\ Or more directly as:
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Antti Karttunen, Sep 14 2017
STATUS
approved