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A087005
Divisors of 2310.
5
1, 2, 3, 5, 6, 7, 10, 11, 14, 15, 21, 22, 30, 33, 35, 42, 55, 66, 70, 77, 105, 110, 154, 165, 210, 231, 330, 385, 462, 770, 1155, 2310
OFFSET
1,2
COMMENTS
2310 = 11# = A002110(5);
divisors of 2310 are squarefree (A005117) and 11-smooth;
a(A000005(2310)) = a(32) = 2310 is the last term.
LINKS
Eric Weisstein's World of Mathematics, Primorial
Eric Weisstein's World of Mathematics, Divisor
MATHEMATICA
squarefrees[s_List] := Block[{a = Subsets[s]}, SortBy[Table[
Product[a[[n, m]], {m, 1, Length[a[[n]]]}], {n, 1, Length[a]}], Abs[#] &]]
A087005 = squarefrees[Prime[Range[5]]](* Fred Daniel Kline, Jan 25 2015 *)
Divisors[2310] (* Harvey P. Dale, Jun 27 2020 *)
PROG
(PARI) divisors(2310) \\ Charles R Greathouse IV, Jun 21 2017
CROSSREFS
KEYWORD
nonn,fini,full,easy
AUTHOR
Reinhard Zumkeller, Jul 29 2003
STATUS
approved