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%I #4 Mar 31 2012 13:20:57
%S 5,5,7,17,13,29,19,41,53,31,67,79,43,89,97,109,61,127,137,73,149,163,
%T 173,181,197,103,211,109,223,229,257,269,139,281,151,307,317,331,337,
%U 349,181,367,193,389,199,401,433,449,233,461,479,241,487,509,521,557
%N Let S(k) be the set of signed differences of pairs of primes <= k. a(n) is the least k such that S(k) contains all residues mod prime(n).
%C First differs from A088047 at the 49th term: prime(49) = 227, a(49) = 233, A088047(49) = 229. The next differences are at prime(n) = 347, 1667, 1697, 1787...
%F a(n) = A109258(prime(n)).
%Y Cf. A088047, A088048, A109258.
%K easy,nonn,less
%O 1,1
%A _David Wasserman_, Jun 23 2005