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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155738 Primes p such that 4*p^2+2*p-1 is also prime 3
2, 3, 5, 13, 19, 23, 43, 47, 67, 79, 103, 109, 149, 157, 179, 193, 239, 353, 373, 397, 419, 487, 499, 503, 523, 547, 563, 569, 587, 619, 677, 683, 787, 797, 839, 853, 863, 929, 1013, 1093, 1193, 1229, 1289, 1303, 1319, 1423, 1433, 1499, 1553, 1619, 1669, 1733 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

FORMULA

A155736 INTERSECT A000040.  [R. J. Mathar, Jan 05 2011]

MATHEMATICA

Select[Prime[Range[400]], PrimeQ[4#^2+2#-1]&]  (* Harvey P. Dale, Mar 22 2011 *)

PROG

(MAGMA) [p: p in PrimesUpTo(1800)| IsPrime(4*p^2 + 2*p - 1)]; // Vincenzo Librandi, Oct 30 2012

CROSSREFS

Cf. A155736, A155737.

Sequence in context: A087763 A104735 A157976 * A215371 A164958 A145908

Adjacent sequences:  A155735 A155736 A155737 * A155739 A155740 A155741

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jan 26 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 4 15:24 EST 2016. Contains 278750 sequences.