33
143
They are 33 and 65
17 Cannot be divided. All the other numbers can be. 15/3, 42/3, 33/3Prime: Can only be divided by itself and 1. 17/17 and 17/1, nothing else works.
33
33
65
33
143
They are 33 and 65
53
17 Cannot be divided. All the other numbers can be. 15/3, 42/3, 33/3Prime: Can only be divided by itself and 1. 17/17 and 17/1, nothing else works.
33
33 = 3 x 11 51 = 3 x 17 41 prime 61 prime
95
One possibility: -3
After the initial number 3, the next number is generated by adding the square of numbers increasing by one at each step and starting with 12. 3 + 12 = 4 4 + 22 = 8 8 + 32 = 17 17 + 42 = 33....and so on The series formula is U(n) = n3/3 - n2/2 + n/6 + 3, which can also be written as :- 3 + n/6(2n2 - 3n + 1) = 3 +n/6(2n - 1)(n - 1)