[seqfan] No "-1" value in A047949?

Jonathan Post jvospost3 at gmail.com
Sat Mar 13 23:38:33 CET 2010

It looks to me as if no "-1" value is there in the first 10,000
values.  Is that correct?  Is there a proof that no such value exists?

A047949  	a(2) = a(3) = 0; for n >= 4, a(n) = largest m such that n-m
and n+m are both primes, or -1 if no such m exists.

What is a(n) asymptotically?

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