login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A121658 Primes not equal to [k*(k or k+1 or k+2)] + 1 where k is a natural number. 0
11, 19, 23, 29, 41, 47, 53, 59, 61, 67, 71, 79, 83, 89, 97, 103, 107, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 199, 211, 223, 227, 229, 233, 239, 241, 251, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes not of the form n^2 + 1 and n^2 + n + 1 and (n+1)^2. Correct version !!

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Sequence in context: A145059 A124139 A136435 * A161504 A165947 A129517

Adjacent sequences:  A121655 A121656 A121657 * A121659 A121660 A121661

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Sep 10 2006, Sep 12 2006.

EXTENSIONS

Edited by R. J. Mathar, Aug 02 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 25 22:30 EDT 2013. Contains 225649 sequences.