A079170 a(n) is the next available entirely straight or curved number, depending on whether n contains a curved digit or not.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 20, 41, 50, 52, 71, 80, 82, 111, 200, 202, 203, 205, 206, 208, 209, 220, 222, 223, 225, 226, 228, 229, 230, 232, 233, 235, 236, 238, 239, 250, 252, 411, 500, 502, 711, 800, 802, 1111, 2000, 2002, 2003, 2005, 2006, 2008, 2009, 2020

Offset

0,3

Links

David Consiglio, Jr., Table of n, a(n) for n = 0..1000

David Consiglio, Jr., Python program

Example

a(10) must be the first entirely curved number greater than 9, as 0 is curved, therefore a(10)=20.
a(17) must be the first entirely straight number greater than 82, therefore a(20)=111.

Crossrefs

Cf. A028373 (straight numbers), A028374 (curved numbers), A079064.

Sequence in context: A180412 A290951 A114800 * A330927 A319387 A076105

Adjacent sequences: A079167 A079168 A079169 * A079171 A079172 A079173

Keyword

nonn,base

Author

Jon Perry, Feb 03 2003

Extensions

a(33) and beyond from David Consiglio, Jr., Oct 31 2023

Status

approved