Wikipedia:Reference desk/Archives/Mathematics/2016 October 10

= October 10 =

Name for such progressions
What is the name of a progression where there are two or more ratios which alternate every step. E.g., two ratios 5 and 2 1,5,10,50,100,500,1000,5000,10000,... Three ratios 5, 2, 10 1,5,10,100,500,1000,10000,... Or 2, 5, 10 1,2,10,100,200,1000,10000,... Or 2, 3, 5, 10 1,2,6,30,300,600,1800,9000,90000,... --Lüboslóv Yęzýkin (talk) 06:39, 10 October 2016 (UTC)


 * I don't know a name for such progressions, but they are geometric progressions added together:
 * (1, 10, 100, 1000, ... ...) + (5, 50, 500, 5000, ... ...)
 * Dolphin ( t ) 11:25, 10 October 2016 (UTC)


 * Interleave sequence. -- ToE 12:17, 10 October 2016 (UTC)


 * Well, it's a specific kind of interleave sequence. And for the ones with three or more ratios, it's a generalization of that, if the article's definition is complete. --69.159.61.230 (talk) 18:32, 10 October 2016 (UTC)

Preferred number. Bo Jacoby (talk) 05:40, 11 October 2016 (UTC).