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A033559
a(n) = (q - p)/2, where p is the largest prime < n and q is the smallest prime > n.
2
1, 2, 1, 3, 2, 2, 2, 3, 1, 3, 2, 2, 2, 3, 1, 3, 2, 2, 2, 5, 3, 3, 3, 3, 3, 4, 1, 4, 3, 3, 3, 3, 3, 5, 2, 2, 2, 3, 1, 3, 2, 2, 2, 5, 3, 3, 3, 3, 3, 6, 3, 3, 3, 3, 3, 4, 1, 4, 3, 3, 3, 3, 3, 5, 2, 2, 2, 3, 1, 4, 3, 3, 3, 3, 3, 5, 2, 2, 2, 5, 3, 3, 3, 3, 3, 7, 4, 4, 4, 4, 4, 4, 4, 6, 2, 2, 2
OFFSET
4,2
MATHEMATICA
a[n_] := (NextPrime[n] - NextPrime[n, -1])/2; Table[a[n], {n, 4, 100}] (* Jean-François Alcover, Apr 16 2013 *)
CROSSREFS
Sequence in context: A377168 A273568 A140720 * A279027 A103151 A035221
KEYWORD
nonn
EXTENSIONS
More terms from Ben Paul Thurston, Mar 30 2007
STATUS
approved