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.

1, 4, 6, 9, 14, 20, 23, 25, 30, 33, 49, 56, 60, 248, 270, 280, 302, 385, 474, 479

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