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A336319
Squarefree part of n*d(n), where d(n) = number of divisors of n (A000005).
2
1, 1, 6, 3, 10, 6, 14, 2, 3, 10, 22, 2, 26, 14, 15, 5, 34, 3, 38, 30, 21, 22, 46, 3, 3, 26, 3, 42, 58, 15, 62, 3, 33, 34, 35, 1, 74, 38, 39, 5, 82, 21, 86, 66, 30, 46, 94, 30, 3, 3, 51, 78, 106, 3, 55, 7, 57, 58, 118, 5, 122, 62, 42, 7, 65, 33, 134, 102, 69, 35, 142, 6, 146
OFFSET
1,3
LINKS
FORMULA
a(n) = A007913(A038040(n)) = A007913(n*A000005(n)).
a(n) = A038040(n)/A000290(A336318(n)).
PROG
(PARI) A336319(n) = core(n*numdiv(n));
CROSSREFS
Cf. A069067 (positions of ones).
Sequence in context: A327000 A249948 A066070 * A376973 A272549 A112456
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 18 2020
STATUS
approved