login
A130177
For p = the n-th prime, a(n) = the least prime q greater than p+2 such that (p^2+q^2)/2 - 1 is a square, or a(n) = 0 if there is no such prime.
1
0, 11, 263, 59, 23, 101, 109, 1278886952463697, 151, 193, 79, 269, 277, 311, 0, 179, 83, 83003, 479, 487, 181, 563, 571, 613, 1201, 157, 141509, 739, 773, 479, 6858037981, 907, 1291, 983, 227, 6133, 1109, 1151, 54331, 1201, 431, 307, 1327
OFFSET
1,2
LINKS
EXAMPLE
a(3) = 263 because (5^2+263^2)/2-1 = 186^2.
a(4) = 59 because (7^2+59^2)/2-1 = 42^2.
a(5) = 23 because (11^2+23^2)/2-1 = 18^2.
CROSSREFS
Sequence in context: A142208 A168466 A091159 * A356212 A100841 A003389
KEYWORD
nonn
AUTHOR
Nick Hobson, May 14 2007
EXTENSIONS
Edited by T. D. Noe and Don Reble, May 14 2007
STATUS
approved