OFFSET
1,1
COMMENTS
Conjecture: for n > 1, a(n) = prime(n+5). - Charles R Greathouse IV, Mar 12 2012
A185154(n) is the smallest prime q, such that A049084(q) + 1 < A049084(a(n) - q - 1). - Reinhard Zumkeller, Mar 12 2012
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
EXAMPLE
11=3+7+1, 17=5+11+1, 19=5+13+1, ...
MATHEMATICA
lst={}; Do[p0=Prime[n]; Do[px=Prime[n+k]; If[PrimeQ[a=p0+px+1], AppendTo[lst, a]], {k, 2, 2*5!}], {n, 6!}]; Take[Union[lst], 222]
PROG
(Haskell)
a157996 n = a157996_list !! (n-1)
a157996_list = map (+ 1) $ filter f a006093_list where
f x = g $ takeWhile (< x) a065091_list where
g [] = False
g [_] = False
g (p:ps@(_:qs)) = (x - p) `elem` qs || g ps
-- Reinhard Zumkeller, Mar 12 2012
(PARI) is(n)=if(!isprime(n), return(0)); my(p=3, q=5); forprime(r=7, n-4, if(isprime(n-1-r) && n-1-r <= p, return(1)); p=q; q=r); 0 \\ Charles R Greathouse IV, Nov 05 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Mar 11 2009
STATUS
approved