The product is 159
3x5x5x5x13 3x53 x13
The seed number is 1, thereafter each number is 2 + (3 x the previous number). 2 + 3x1 = 5 2 + 3x5 = 17 2 + 3x17 = 53 2 + 3x53 = 161 2 + 3x161 = 485
There are none: 3x5=15 32 x5=45 33 x5=135 34 x5=405 3x52 =75 3x53 =375 32 x52 =225 and you wanted less than 225. No combination of 3's and 5's works.