1 + 71 = 8 8 + 72 = 57 57 + 73 = 400 400 + 74 = 2801
57
37: How? Every time a new number is put into the sequence, when you subtract it from the number before it, it will equal an odd number of greater value. For example; 72-69=3 69-64=5 64-57=7 57-48=9 48-37=11
LVII (50+5+1+1 = 57)
At each step the number being subtracted is reduced by 9 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57..........which is the next number.
21
1 + 71 = 8 8 + 72 = 57 57 + 73 = 400 400 + 74 = 2801
57
37: How? Every time a new number is put into the sequence, when you subtract it from the number before it, it will equal an odd number of greater value. For example; 72-69=3 69-64=5 64-57=7 57-48=9 48-37=11
The difference between one number and the next in the sequence is decreasing by 9 each time. Therefore, the difference between -4 and the next number will be equal to 62 - 9 = 53. The next number is therefore equal to -4 - 53 = -57.
It is a quadratic sequence (order 2) t(n) = (9n2 - 205n + 792)/2 for n = 1, 2, 3, ... and the next number is -57
57
No, 57 = 3 x 19, so it's not a prime number
LVII (50+5+1+1 = 57)
At each step the number being subtracted is reduced by 9 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57..........which is the next number.
342
356