login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A136742 Product of the n-th run of squarefree numbers. 6
6, 210, 110, 2730, 17, 19, 10626, 26, 26970, 39270, 54834, 74046, 2162, 51, 53, 55, 195054, 3782, 287430, 342930, 5402, 474474, 6806, 635970, 89, 91, 830490, 97, 1061106, 1190910, 1330890, 1481430, 14042, 15006, 127, 2196870, 17822, 2627934 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are squarefree;

a(n) mod A072284(n) = 0;

A136743(n) = A001221(a(n)).

LINKS

Table of n, a(n) for n=1..38.

Eric Weisstein's World of Mathematics, Squarefree

FORMULA

a(n) = PRODUCT(A072284(n)+k: 0<=k < A120992(n));

EXAMPLE

n=10: A072284(10)=33, A120992(10)=3: a(10)=33*34*35=39270.

CROSSREFS

Cf. A005117.

Sequence in context: A172530 A201237 A120436 * A068969 A094805 A055193

Adjacent sequences:  A136739 A136740 A136741 * A136743 A136744 A136745

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jan 20 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 20 23:06 EST 2019. Contains 329348 sequences. (Running on oeis4.)