References to A047160

For n >= 2, a(n) = smallest number m >= 0 such that n-m and n+m are both primes, or -1 if no such m exists.
0, 0, 1, 0, 1, 0, 3, 2, 3, 0, 1, 0, 3, 2, 3, 0, 1, 0, 3, 2, 9, 0, 5, 6, 3, 4, 9, 0, 1, 0, 9, 4, 3, 6


2 seqfan posts

Sun Mar 14 21:50:33 CET 2010    [seqfan] Re: No "-1" value in A047949?
Sun Mar 14 19:29:14 CET 2010    [seqfan] Re: No "-1" value in A047949?

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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