OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
(P_n+1 - P_n)/2 is even but not divisible by 4.
MATHEMATICA
a = Table[Prime[n], {n, 2, 200}]; b = {}; Do[d = (a[[n + 1]] - a[[n]])/2; If[ EvenQ[ a[[n]] + d] && Mod[d, 6] == 3, b = Append[b, a[[n]] + d]], {n, 1, 198}]; b
Select[Mean/@Select[Partition[Prime[Range[200]], 2, 1], Divisible[(#[[2]]- #[[1]])/ 2, 3]&], EvenQ] (* Harvey P. Dale, May 09 2021 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Marco Matosic, Jun 24 2002
EXTENSIONS
Edited by N. J. A. Sloane and Robert G. Wilson v, Jun 27 2002
STATUS
approved