0
45.
These are the triangular numbers.
To find the next one, add one more than the previous difference:
1, 3 → difference is 2, so add 2 + 1 = 3 → 3 + 3 = 6
3, 6 → difference is 3, so add 3 + 1 = 4 → 6 + 4 = 10
etc
28, 36 → difference is 8, so add 8 + 1 = 9 → 36 + 9 = 45
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∙ 11y ago
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the answer is 1
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