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!)
A137800 Consider the first run of composites that contains at least two numbers whose largest prime factor is prime(n), n >= 2. a(n) is the second of these numbers. 2
27, 125, 147, 539, 2197, 2992, 3249, 50255, 11774, 15717, 62271, 265680, 172000, 34122, 1133458, 2313744, 1060851, 332387, 1334232, 404931, 1388583, 1357299, 15800793, 5516390, 66896138, 11962935, 6085090, 129761884, 43216624, 90972640 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

For comments, examples and programs see sequence A137799, which gives the first of these numbers.

LINKS

Table of n, a(n) for n=2..31.

CROSSREFS

Cf. A137799.

Sequence in context: A275430 A145555 A293894 * A125497 A179145 A118092

Adjacent sequences:  A137797 A137798 A137799 * A137801 A137802 A137803

KEYWORD

nonn

AUTHOR

Enoch Haga, Feb 11 2008

EXTENSIONS

Edited and a(18) through a(31) added by Klaus Brockhaus, Feb 15 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 December 7 20:39 EST 2021. Contains 349589 sequences. (Running on oeis4.)