OFFSET
0,2
COMMENTS
a(n) = smallest k > 0 such that there are n prime pairs (p,q), p < q, with (p+q)/2 = 2*k.
LINKS
Klaus Brockhaus, Table of n, a(n) for n = 0..1000
EXAMPLE
Number of prime pairs (p,q) with (p+q)/2 = 2*1 is 0, hence a(0) = 1.
9 is the smallest k such that there are four prime pairs (p,q) with (p+q)/2 = 2*k: (5+31)/2 = (7+29)/2 = (13+23)/2 = (17+19)/2 = 18 = 2*9. Hence a(4) = 9.
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Nov 20 2007
STATUS
approved