Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A076763
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A076763 1-apexes of omega: n such that omega(n-1) < omega(n) > omega(n+1), where omega(m) = the number of distinct prime factors of m. +0
1
6, 10, 12, 18, 24, 26, 28, 30, 42, 48, 60, 66, 70, 72, 78, 80, 82, 84, 90, 102, 105, 108, 110, 114, 120, 126, 130, 132, 138, 140, 150, 154, 156, 165, 168, 170, 174, 180, 182, 186, 190, 192, 195, 198, 204, 210, 220, 222, 228, 234, 238, 240, 242, 246, 252, 255 (list; graph; listen)
OFFSET

1,1

COMMENT

I call n a "k-apex" (or "apex of height k") of the arithmetical function f if n satisfies f(n-k) < ... < f(n-1) < f(n) > f(n+1) > .... > f(n+k).

MATHEMATICA

omega[n_] := Length[FactorInteger[n]]; Select[Range[3, 500], omega[ # - 1] < omega[ # ] > omega[ # + 1] &]

CROSSREFS

Cf. A001222.

Sequence in context: A114520 A046288 A101933 this_sequence A064712 A098669 A046363

Adjacent sequences: A076760 A076761 A076762 this_sequence A076764 A076765 A076766

KEYWORD

nonn

AUTHOR

Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Nov 13 2002

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.


AT&T Labs Research