login
A338449
a(n) is the radical of A338338(n).
2
1, 2, 2, 6, 3, 3, 5, 10, 10, 2, 7, 14, 14, 6, 15, 30, 10, 2, 11, 22, 22, 6, 21, 42, 14, 6, 3, 33, 55, 110, 10, 26, 13, 39, 6, 6, 2, 17, 34, 34, 38, 19, 57, 15, 30, 70, 42, 21, 51, 85, 170, 10, 46, 23, 69, 6, 66, 22, 77, 35, 105, 15, 6, 26, 78, 39, 3, 5, 65
OFFSET
1,2
LINKS
FORMULA
a(n) = A007947(A338338(n)).
EXAMPLE
For n = 9:
- A338338(9) = 20 = 2^2 * 5,
- so a(9) = 2 * 5 = 10.
PROG
(PARI) \\ See Links section.
CROSSREFS
Sequence in context: A130478 A308140 A306464 * A163890 A298983 A128623
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Oct 28 2020
STATUS
approved