OFFSET
1,1
COMMENTS
EXAMPLE
a(1)=3 because prime(1)=2 and 4*2+3=11
(prime).
MATHEMATICA
dbkn[n_]:=Module[{t=4*Prime[n]}, NextPrime[t]-t]; Array[dbkn, 100] (* Harvey P. Dale, Nov 12 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 18 2005
STATUS
approved