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

Author

Patrick De Geest, Apr 15 1998

Keywords

• nonn
• base

Comments

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

Examples

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

Crossrefs

Cf. A032572. See also A032563 for explanation.

Programs

Mathematica

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

Extensions

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