

A085555


Primes p of the form x^2+4, such that either p2 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



MAPLE

select(t > isprime(t) and (isprime(t+2) or isprime(t2)), [seq(x^2+4, x=1..10^4, 2)]); # Robert Israel, May 14 2018


MATHEMATICA

okQ[n_]:=PrimeQ[n]&&(PrimeQ[n2]PrimeQ[n+2]); Select[Range[ 2000]^2+4, okQ] (* Harvey P. Dale, Jul 14 2011 *)


CROSSREFS



KEYWORD

easy,nonn


AUTHOR



EXTENSIONS



STATUS

approved



