login
A109257
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).
2
5, 5, 7, 17, 13, 29, 19, 41, 53, 31, 67, 79, 43, 89, 97, 109, 61, 127, 137, 73, 149, 163, 173, 181, 197, 103, 211, 109, 223, 229, 257, 269, 139, 281, 151, 307, 317, 331, 337, 349, 181, 367, 193, 389, 199, 401, 433, 449, 233, 461, 479, 241, 487, 509, 521, 557
OFFSET
1,1
COMMENTS
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...
FORMULA
a(n) = A109258(prime(n)).
CROSSREFS
KEYWORD
easy,nonn,less
AUTHOR
David Wasserman, Jun 23 2005
STATUS
approved