perplexus.info :: Sequences : Tango

Tango (Posted on 2004-11-11)

No complicated set-up for this one! Quite simply, what number comes next and why?
2 4 6 9 11 15 20 ??

See The Solution Submitted by Jenny Turner

Rating: 3.1429 (7 votes)

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I got it (I think.....)

| Comment 6 of 11 |

2,4,6,9,11,15,20,40,51,55,60,90,101,105,110,150

Using Roman numerals, the sequence uses only two symbols ie.

II, IV, VI, iX, XI, XX XL, LI......

Posted by joe on 2004-11-13 10:55:45

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