OFFSET
0,1
COMMENTS
This sequence is closely related to the Goldbach conjecture, which is equivalent to a(0) = 2; that is, there are no numbers other than 2 and 4 that have no representations as the sum of two odd primes. This is sequence A000974, except for the first two terms.
EXAMPLE
There are 3 even numbers with one representation: 6 = 3+3, 8 = 3+5, and 12 = 5+7. Hence, a(1) = 3.
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Oct 31 2013
STATUS
approved