OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
prime(4)=7 is in the sequence because 7+4*4 = 23 is prime.
prime(6)=13 is in the sequence because 13+4*6 = 37 is prime.
MATHEMATICA
Prime[Select[Range[180], PrimeQ[Prime[#] + 4 #] &]]
PROG
(Magma) [NthPrime(n): n in [1..200] | IsPrime(NthPrime(n)+4*n)]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Feb 05 2015
STATUS
approved