OFFSET
1,5
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
FORMULA
MATHEMATICA
Table[DivisorSum[n, MoebiusMu[n/#] (2 # - DigitCount[2 #, 2, 1] - DivisorSigma[1, #]) &], {n, 82}] (* Michael De Vlieger, Mar 11 2019 *)
PROG
CROSSREFS
KEYWORD
sign
AUTHOR
Antti Karttunen, Dec 26 2017
STATUS
approved