The OEIS is supported by the many generous donors to the OEIS Foundation.

 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 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A122464 Smooth Power Trios: a(n) is the largest of three successive numbers a(n)-j, j=0..2, such that the largest prime factor of a(n)-j is <= the n-th root of a(n)-j. 2
 4, 50, 134850, 116026275, 138982583000, 1348770149848002 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The fifth term was found by R. Gerbicz, the others were found by F. Schneider. LINKS Fred Schneider and R. Gerbicz, Smooth Power Trios. EXAMPLE Example for n=6: 1348770149848002 = 2 x 3 x 7 x 23 x 41 x 61^2 x 149 x 239 x 257, 1348770149848001 = 19^3 x 89 x 103 x 229 x 283 x 331, 1348770149848000 = 2^6 x 5^3 x 11 x 29 x 109 x 151 x 163 x 197, This satisfies because 331 <= floor(1348770149848000^(1/6)) = 332. CROSSREFS Cf. A122463, A122465. Sequence in context: A193157 A235604 A221477 * A226375 A347551 A048995 Adjacent sequences: A122461 A122462 A122463 * A122465 A122466 A122467 KEYWORD hard,more,nonn AUTHOR Fred Schneider, Sep 09 2006 STATUS approved

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

Last modified December 9 11:21 EST 2022. Contains 358700 sequences. (Running on oeis4.)