Question 20
A sequence has terms divisible by 3, each one being a square number minus 1:
$$3,15,24,48,63,\ldots.$$
Find the remainder when its 2018th term is divided by 1000.
Sequence convention for self-study: list all positive integers satisfying the two properties in strictly increasing order, with no omissions, as indicated by the displayed initial terms.
$$3,15,24,48,63,\ldots.$$
Find the remainder when its 2018th term is divided by 1000.
Sequence convention for self-study: list all positive integers satisfying the two properties in strictly increasing order, with no omissions, as indicated by the displayed initial terms.