Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A136355
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A136355 Odd composite N with k consecutive prime factors not followed by prime N+2. +0
3
1155, 255255, 4849845, 111546435 (list; graph; listen)
OFFSET

1,1

COMMENT

This sequence is different from A070826 and/or A118750

FORMULA

Compute the product of k consecutive sequences of prime factors 3,5,7,11,etc. where k=1,2,3,4,5,etc. Where odd composite N is not followed by prime N+2 add N to the sequence.

EXAMPLE

a(1)=1155 because 1157 is not prime.

CROSSREFS

Cf. A136349-A136354 A136356-A136358 A070826 A118750.

Sequence in context: A046390 A088012 A046406 this_sequence A062915 A034979 A031622

Adjacent sequences: A136352 A136353 A136354 this_sequence A136356 A136357 A136358

KEYWORD

easy,more,nonn,uned

AUTHOR

Enoch Haga (Enokh(AT)comcast.net), Dec 25 2007

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 23 10:48 EDT 2008. Contains 142285 sequences.


AT&T Labs Research