login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A162857 Primes of form 4p-1, p a prime. 2
7, 11, 19, 43, 67, 163, 211, 283, 331, 523, 547, 691, 787, 907, 1051, 1123, 1171, 1531, 1723, 1867, 2011, 2083, 2251, 2347, 2371, 2467, 2707, 2731, 2803, 2971, 3187, 3307, 3547, 3643, 3907, 3931, 4051, 4243, 4363, 4603, 4651, 4723, 5107, 5227, 5443, 5923 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If 4p-1 is prime then n^2+n+p = p(4p-1) for some n = 1,2,3,...[Pf. Let n+1 = 2p, etc.].

LINKS

Table of n, a(n) for n=1..46.

CROSSREFS

Sequence in context: A055939 A154555 A285016 * A307965 A323109 A023267

Adjacent sequences:  A162854 A162855 A162856 * A162858 A162859 A162860

KEYWORD

nonn

AUTHOR

Daniel Tisdale, Jul 14 2009

EXTENSIONS

More terms from N. J. A. Sloane, Jul 19 2009

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 22 17:14 EST 2020. Contains 332140 sequences. (Running on oeis4.)