Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A073046
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A073046 Write 2n=p+q (p,q prime), p*q minimal; then a(n)=p*q. +0
2
4, 9, 15, 21, 35, 33, 39, 65, 51, 57, 95, 69, 115, 161, 87, 93, 155, 217, 111, 185, 123, 129, 215, 141, 235, 329, 159, 265, 371, 177, 183, 305, 427, 201, 335, 213, 219, 365, 511, 237, 395, 249, 415, 581, 267, 445, 623, 1501, 291, 485, 303, 309, 515, 321, 327 (list; graph; listen)
OFFSET

2,1

COMMENT

Least semiprime whose sum of prime factors = 2n.

EXAMPLE

n=13: 2n=26; 26=23+3=19+7=13+13; 23*3=minimal => p*q=23*3=69

CROSSREFS

Sequence in context: A103395 A103393 A103392 this_sequence A066495 A134227 A055999

Adjacent sequences: A073043 A073044 A073045 this_sequence A073047 A073048 A073049

KEYWORD

nonn

AUTHOR

Werner Sand (werner.sand(AT)tiscalimail.de), Aug 31 2002

EXTENSIONS

Corrected by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 11 2005

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 | The OEIS Foundation | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified March 17 15:31 EDT 2010. Contains 173524 sequences.


AT&T Labs Research