30-17 = 13
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-3017
1508.5
300 110 006 ___ 416 ___
There are probably many possible answers. I propose 9 as the only perfect square
This sequence is constructed from the sum of successive pairs of primes. The next number is 30.2+3 = 53+5 = 85+7 = 127+11 = 1811+13 = 2413+17 = 3017+19 = 3619+23 = 42...Just add each pair of consecutive prime numbers to find the next number.It is very likely, however, that this solution is not unique.