

A301516


Numbers n with decimal expansion (d_1, ..., d_k) such that the convex hull of the set of points { (i, d_i), i = 1..k } has positive area.


1



100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 148, 149, 150, 151, 152, 153, 154, 155
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OFFSET

1,1


COMMENTS

This sequence is the complement of the straightline numbers (0..99 alongside A135643).
This sequence first differs from A134999 at n = 857: a(857) = 1001 whereas A134999(857) = 1011.


LINKS

Table of n, a(n) for n=1..52.


PROG

(PARI) is(n, base=10) = my (d=digits(n, base)); for (i=1, #d2, if (d[i]+d[i+2]2*d[i+1], return (1))); return (0)


CROSSREFS

Cf. A134999, A135643, A302907.
Sequence in context: A000865 A135600 A134999 * A204581 A135641 A252480
Adjacent sequences: A301513 A301514 A301515 * A301517 A301518 A301519


KEYWORD

nonn,base


AUTHOR

Rémy Sigrist, Dec 16 2018


STATUS

approved



