Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A085747
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A085747 Least positive k such that n!+k is a semiprime. +0
5
3, 2, 3, 1, 1, 1, 1, 1, 5, 1, 3, 17, 1, 1, 7, 2, 3, 23, 1, 1, 11, 29, 3, 1, 1, 1, 37, 1, 41, 2, 19, 11, 11, 1, 7, 3, 41, 1, 13, 127, 47, 59, 2, 37, 5, 37, 59, 1, 2, 73, 59, 79, 73, 1, 1 (list; graph; listen)
OFFSET

1,1

COMMENT

Sequence entries must be 1 or a prime.

LINKS

Dario Alejandro Alpern, Factorization using the Elliptic Curve Method

Hisanori Mishima, Factorization of n! + 1 (n = 1 to 100)

MATHEMATICA

PrimeFactors[n_Integer] := Flatten[ Table[ # [[1]], { # [[2]]}] & /@ FactorInteger[n]];

CROSSREFS

Cf. A089538, A089539, A089540, A089541.

Sequence in context: A086099 A048967 A103497 this_sequence A106693 A107335 A082391

Adjacent sequences: A085744 A085745 A085746 this_sequence A085748 A085749 A085750

KEYWORD

more,nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jul 21 2003

EXTENSIONS

Extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 27 2003

a(55) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 09 2003

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 September 7 15:23 EDT 2008. Contains 143483 sequences.


AT&T Labs Research