A032571 Numbers k whose decimal representation, read as a base-20 value and divided by k, yields an integer.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 195, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1280, 1320, 1898, 1948, 1950, 2000, 2640, 3000, 3960, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 12800, 13200, 15545, 16000

Offset

1,2

Comments

Original name: Base 20 value of decimal denominator divided by this decimal value (n) is an integer.

Links

Table of n, a(n) for n=1..49.

Example

195 is a term: 195_20 = 585 = 195*3. - Jon E. Schoenfield, Oct 25 2019

Mathematica

Select[Range[20000], IntegerQ[FromDigits[IntegerDigits[#], 20]/#]&] (* Harvey P. Dale, Jan 18 2025 *)

Crossrefs

Cf. A032572. See also A032563 for explanation.

Sequence in context: A180480 A080459 A093475 * A070958 A051596 A071061

Adjacent sequences: A032568 A032569 A032570 * A032572 A032573 A032574

Keyword

nonn,base

Author

Patrick De Geest, Apr 15 1998

Extensions

Offset changed and Name edited by Jon E. Schoenfield, Oct 25 2019

Status

approved