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1, 7, 13, 19, 91, 133, 247, 1729 The prime factors are 7, 13, 19
13
15. It is the difference between 5 and 20.
The difference between 7 and 3 is 4.
13 + 7 = 20 13 - 7 = 6
7
A "difference" is either the result of a subtraction (the difference between 7 and 5 is 7 minus 5), or its absolute value (so that the difference between 7 and 5 is the same as the difference between 5 and 7).
-5
37. The difference between the 1st and 2nd term is 5, the difference between the 2nd and 3rd term is 6, the difference between the 3rd and 4th term is 7, etc. The next term is +9 from the last term given.
37, this sequence counts up from 5 the difference between 2 and 7. the difference between 20 and 28 is 8 making the next number 9, and 28 and 9 = 37.
19
37. The difference between two consecutive numbers goes on increasing. 7-2=5; 13-7=6; 20-13=7; 28-20=8; 37-28=9...and so on.