login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A290043 Prime factors of A290042. 1
2, 3, 5, 17, 19, 23, 7433, 7451, 7457, 7459, 3080515841187937, 3080515841187947, 3080515841187989, 3080515841188039, 3080515841188057 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

FORMULA

Product_{k=n(n-1)/2 + 1..n(n+1)/2} a(k) = A290042(n) for n > 0.

EXAMPLE

A290042(2) = 15 = 3*5, so 3 and 5 are members.

CROSSREFS

Cf. A290042.

Sequence in context: A341786 A129673 A215372 * A058501 A215356 A249410

Adjacent sequences:  A290040 A290041 A290042 * A290044 A290045 A290046

KEYWORD

nonn

AUTHOR

Jonathan Sondow, Aug 20 2017

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 December 1 13:38 EST 2021. Contains 349429 sequences. (Running on oeis4.)