OFFSET
0,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
EXAMPLE
2*17+1=35, 4*17+1=69, therefore 68 is in the sequence.
MATHEMATICA
Select[4*Prime[Range[90]], AllTrue[{#/2, #}+1, CompositeQ]&] (* Harvey P. Dale, Dec 28 2023 *)
PROG
(PARI) forprime (p=3, 200, if (!isprime(2*p+1) && !isprime(4*p+1), print1(4*p", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon Perry, Jan 31 2003
EXTENSIONS
More terms from Michel Marcus, Mar 17 2014
STATUS
approved