|
1, 2, 3, 4, 5, 4, 7, 8, 9, 4, 11, 8, 13, 4, 9, 16, 17, 12, 19, 8, 9, 4, 23, 16, 25, 4, 27, 8, 29, 12, 31, 32, 9, 4, 25, 24, 37, 4, 9, 16, 41, 12, 43, 8, 27, 4, 47, 32, 49, 20, 9, 8, 53, 36, 25, 16, 9, 4, 59, 24, 61, 4, 27, 64, 25, 12, 67, 8, 9, 20, 71, 48, 73, 4, 45, 8, 49, 12, 79, 32, 81
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
FORMULA
|
a(n) <= n; a(n) = n iff n is a prime power: a(A000961(n)) = A000961(n);
|
|
MATHEMATICA
|
a[n_] := Module[{ps = First /@ FactorInteger[n]}, n * First[ps] / Last[ps]]; Array[a, 100] (* Amiram Eldar, Nov 27 2020 *)
|
|
PROG
|
(PARI) a(n) = if (n==1, 1, my(f=factor(n)[, 1]~); n*vecmin(f)/vecmax(f)); \\ Michel Marcus, Nov 27 2020
|
|
CROSSREFS
|
Cf. A000290, A001221, A001222, A006530, A000961, A020639, A046665, A052126, A066048, A074320, A130064.
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|