In the following sequence, consisting of positive integers, the first term is a one digit number.

?, ? , 65, 61, 37, 58, 89, 145, ...

A) What is the first term?

B) What is the next term that is a one digit number?

9, 81

square each individual number and sum them
9^2=81
8^2=64, 1^2=1, 64+1=65
6^2=36, 5^2=25, 36+25=61

...

145, 42, 20, 4

the next 1 digit number will be 4

Posted by derek on 2003-07-15 08:24:11