On e possibility is 105, 230.
These numbers are generated by the quartic polynomial:
t(n) = (15n4 - 154n3 + 501n2 - 530n + 1488)/24 where n = 1, 2, 3, ...
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Honestly you should be able to do this yourself. 51 53 55 57 59
It is 57.
53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64
20 and 112 25 and 50 20, 50, 60 and 70
The number between 53 and 61 is 57. To find the number between two given numbers, you would typically calculate the average of the two numbers. In this case, (53 + 61) / 2 = 57.