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A383287
a(n) = 1 if A276075(n) is a multiple of 4, otherwise 0, where A276075 is fully additive with a(p) = PrimePi(p)!.
2
1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1
OFFSET
1
FORMULA
a(n) = A121262(A276075(n)).
PROG
(PARI)
A276075(n) = { my(f = factor(n)); sum(k=1, #f~, f[k, 2]*(primepi(f[k, 1])!)); };
A383287(n) = !(A276075(n)%4);
CROSSREFS
Characteristic function of A383288.
Cf. also A369001, A372573.
Sequence in context: A265718 A267463 A264442 * A266243 A266608 A333818
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 15 2025
STATUS
approved