The following sequence gives a series of square numbers,

10% of 10=1,
20% 0f 20=4,
30% of 30=9,
40% of 40=16,........
90% 0f 90=81,
100% 0f 100=100,.....

Is it possible to create a similar series that gives us triangular numbers as the result?

5% of 20=1,
10% 0f 30=3,
15% of 40=6,
20% of 50=10
25.....60 ..15
30 70 21
....
70....150.....105
....
100 ....210.... 210

so what else is new???

Edited on January 18, 2005, 2:22 pm

Posted by Ady TZIDON on 2005-01-18 14:21:18