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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A144974 Centered heptagonal prime numbers. 0
43, 71, 197, 463, 547, 953, 1471, 1933, 2647, 2843, 3697, 4663, 5741, 8233, 9283, 10781, 11173, 12391, 14561, 18397, 20483, 29303, 29947, 34651, 37493, 41203, 46691, 50821, 54251, 56897, 57793, 65213, 68111, 72073, 76147, 84631, 89041 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..37.

Wikipedia, Centered_heptagonal_prime_number

MATHEMATICA

lst={}; Do[p=(7*n^2-7*n+2)/2; If[PrimeQ[p], AppendTo[lst, p]], {n, 6!}]; lst

CROSSREFS

Sequence in context: A175730 A087765 A141971 * A144975 A087699 A054807

Adjacent sequences:  A144971 A144972 A144973 * A144975 A144976 A144977

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Sep 27 2008

STATUS

approved

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

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

Last modified December 18 04:30 EST 2014. Contains 252079 sequences.