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A286303 The list of x-coordinates for which nonempty columns arise in the set arising from {(1, 0),(2, 0),(0, 1)}, the classical Ulam sequence on the x-axis augmented by a vector in the orthogonal direction. 0
1, 4, 6, 9, 14, 20, 23, 25, 30, 33, 49, 56, 60, 248, 270, 280, 302, 385, 474, 479 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

Noah Kravitz, Stefan Steinerberger, Ulam Sequences and Ulam Sets, arXiv:1705.01883 [math.CO], 2017.

CROSSREFS

Cf. A002858.

Sequence in context: A310672 A310673 A171664 * A084336 A094750 A241013

Adjacent sequences:  A286300 A286301 A286302 * A286304 A286305 A286306

KEYWORD

nonn,more

AUTHOR

Michel Marcus, May 05 2017

STATUS

approved

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Last modified October 15 12:31 EDT 2019. Contains 328026 sequences. (Running on oeis4.)