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A345064
a(n) = 1 if A071324(n) is equal to A206369(n), otherwise 0; characteristic function of A317923.
4
1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0
OFFSET
1
FORMULA
a(n) = [A071324(n) = A206369(n)], where [ ] is the Iverson bracket.
a(n) = [A345062(n)==1] * [A345063(n)==1].
a(n) = 1 iff A345060(n) = 0.
a(n) >= A010055(n) for all n.
PROG
(PARI)
A071324(n) = my(d=Vecrev(divisors(n))); sum(k=1, #d, (-1)^(k+1)*d[k]); \\ From A071324
A206369(n) = sumdiv(n, d, eulerphi(n/d) * issquare(d)); \\ From A206369
A345064(n) = (A071324(n)==A206369(n));
CROSSREFS
Characteristic function of A317923.
Sequence in context: A324290 A325964 A344885 * A076699 A373851 A142720
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 07 2021
STATUS
approved