## 1, 3, 7, 11, 17, 23, 31, 50, 60, 71, ...Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.What are the next five terms in this sequence?
1, 3, 7, 11, 17, 23, 31, 50, 60, 71, 83, 97, 111, 127, 153, 171, 190, 210, 231, 263, 287, 311, 337, 373, ___, ___, ___, ___, ___, ... ## Answer501, 530, 570, 601, 633.In all the natural numbers that don't contain the "unlucky" digit 4, the first one is 1, skip one and get 3, skip two and get 7, skip three and get 11, and so on. It can also be said that these are the triangular numbers in the nonary system, except that the digits 0, 1, 2, 3, 5, 6, 7, 8, 9 are being used to represent 0, 1, 2, 3, 4, 5, 6, 7, 8. Hide ## What Next?
Tweet
See another brain teaser just like this one...Or, just get a random brain teaser If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own. Back to Top |