The spacing is 6
1+6=7
7+6=13
13+6=19
19+6=25
so the missing number in the sequence is 13
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Each part equals -19. 0-19=-19, 4-23=-19,...so 25-X=-19. This means 25+19=X, so the missing number is 25+19 which is 44.
22
The answer will depend on where in the sequence the missing number is:Using only quartic polynomials, the solutions are:3, 10, 25, 54, 10310, 11.75, 25, 54, 10310, 25, 33.8333..., 54, 10310, 25, 54, 84.25, 10310, 25, 54, 103, 178.Other functional forms will generate many more answers.
The missing numbers are 9 & 49.The sequence is 1x1, 2x2, 3x3, 4x4, 5x5, 6x6, 7x7& 8x8.
This sequence is an interlace of two sequences: 13,17,21,25,29,33,..(each number 4 higher than the previous one) and 10, 15, 25,30,35(each number 5 more than the previous one). So the sequence continues 30,29,35,33,...