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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A181291 A038703 A283806 * A074931 A023226 A113169

Adjacent sequences:  A163583 A163584 A163585 * A163587 A163588 A163589

KEYWORD

nonn,uned

AUTHOR

Milton L. Brown (miltbrown(AT)earthlink.net), Jul 31 2009

STATUS

approved

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Last modified January 27 11:59 EST 2021. Contains 340465 sequences. (Running on oeis4.)