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: (15+37)/2 = 26
26
Of that group, 19 and 37 are prime.
It seems each term(except the first one obviously) is generated by adding 11 to previous one. 4 15 = 4 + 11 26 = 15 + 11 37 = 26 + 11 The next term in the sequence will be then: 48 = 37 + 11
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.
The sequence of number is 7.
It is: (15+37)/2 = 26
31. Each number is derived from the sequence minus 6 then plus 17. Cobblestoneplaza.com
26
2626 is.
37
Of that group, 19 and 37 are prime.
2 9 5 13 10 19 17 27 26 37 37 49 50 ...The sequence is composed of these two sub-sequences:2 5 10 17 26 37 50 (+3,+5,+7,+9,+11,...)9 13 19 27 37 49 (+4,+6,+8,+10,+12,...)
39