The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A085555 Primes p of the form x^2+4, such that either p-2 or p+2 is prime. 1
 5, 13, 29, 229, 1093, 1229, 2029, 3253, 4229, 13693, 21613, 59053, 65029, 91813, 140629, 178933, 199813, 205213, 227533, 328333, 366029, 567013, 700573, 804613, 815413, 819029, 1071229, 1155629, 1311029, 1575029, 2241013, 3629029, 3822029 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE select(t -> isprime(t) and (isprime(t+2) or isprime(t-2)), [seq(x^2+4, x=1..10^4, 2)]); # Robert Israel, May 14 2018 MATHEMATICA okQ[n_]:=PrimeQ[n]&&(PrimeQ[n-2]||PrimeQ[n+2]); Select[Range[ 2000]^2+4, okQ] (* Harvey P. Dale, Jul 14 2011 *) CROSSREFS Sequence in context: A146420 A147492 A182069 * A224888 A256314 A002768 Adjacent sequences: A085552 A085553 A085554 * A085556 A085557 A085558 KEYWORD easy,nonn AUTHOR Cino Hilliard, Jul 04 2003 EXTENSIONS Edited by Don Reble, May 03 2006 STATUS approved

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

Last modified May 21 19:35 EDT 2024. Contains 372738 sequences. (Running on oeis4.)