OFFSET
0,2
COMMENTS
When a(n) is prime, it is the second member of a twin prime pair. Moreover, every twin prime pair except 3,5 is found in this manner.
All members between 7 and 333 are also in A076974. - Ralf Stephan, Feb 28 2014
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
FORMULA
a(n+1) = A151800(a(n)) + 2. - Reinhard Zumkeller, Feb 28 2014
MATHEMATICA
a[0] := 1; a[n_] := a[n] = Prime[PrimePi[a[n - 1]] + 1] + 2; Table[a[n], {n, 0, 59}] (* Alonso del Arte, Feb 24 2014 *)
PROG
(Haskell)
a238327 n = a238327_list !! n
a238327_list = iterate ((+ 2) . a151800) 1
-- Reinhard Zumkeller, Feb 28 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Curtis Herink, Feb 24 2014
STATUS
approved