A087005 - OEIS

A087005

Divisors of 2310.

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

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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

STATUS

approved