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A163586
Prime helix with extended Ulam spirals, with primes at the center. Each of these is the center of its extended Ulam spiral until it bifurcates into the next twin prime on the main diagonal with 4n^2-2n+p
0
3, 5, 17, 29, 41, 71, 101, 191
OFFSET
1,1
CROSSREFS
Sequence in context: A181291 A038703 A283806 * A074931 A023226 A113169
KEYWORD
nonn,uned
AUTHOR
Milton L. Brown (miltbrown(AT)earthlink.net), Jul 31 2009
STATUS
approved