It is (5+37)/2 = 21.
Assuming the space is between the 5 and the 37, you could put 21 in there and all the numbers would be 16 apart from each other.
It is an Arithmetic Progression with a constant difference of 11 and first term 15.
It can, for example, in base 7 arithmetic.
37.
36
Assuming the space is between the 5 and the 37, you could put 21 in there and all the numbers would be 16 apart from each other.
32
It is an Arithmetic Progression with a constant difference of 11 and first term 15.
17. The numbers are being increased by odd numbers beginning with 3.
It can, for example, in base 7 arithmetic.
The sequence of number is 7.
8
37.
Assuming the sequence does not merely skip from 13 to 49, and instead carries on in the same pattern, the sequence proceeds thus:1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49.This is thirteen terms. The formula for finding these terms is 4x-3.
174
57
36