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A323154
a(n) = 1 if n divides A048146(n) = (sigma(n)-usigma(n)), 0 otherwise.
1
1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0
OFFSET
1
COMMENTS
Characteristic function of A064594.
a(n) = 1 if and only if n divides A048146(n) = (A000203(n) - A034448(n)).
Differs from A008966 at n = 24, 112, 1984, 2520, 31320, 32512, ... (A064595).
PROG
(PARI)
A034448(n) = { my(f=factorint(n)); prod(k=1, #f~, 1+(f[k, 1]^f[k, 2])); }; \\ After code in A034448
A323154(n) = !((sigma(n)-A034448(n))%n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 09 2019
STATUS
approved