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Relevant wiki: Perfect Numbers
ATTENTION! This is complicated and I hope you pay attention closely.
So, the next term is derived by multiplying the next even perfect number by the next prime number and adding the previous term. e g . 6 × 2 + 1 = 1 3 where 6 is the 1 s t even perfect number and 2 is the 1 s t prime number and where 1 is the previous term.
According to the formula (for deriving even perfect numbers), If 2 p − 1 is prime then ( 2 p − 1 ) ( 2 p − 1 ) is (an even) perfect. So applying this formula, the next even perfect numbers are 2 8 , 4 9 6 , 8 1 2 8 , 3 3 5 5 0 3 3 6 . (We are stopping at 33550336 for the purpose of this question if not the numbers get crazy big and I mean it: c r a z y )
Allow me to demonstrate the numbers in the question:
9 7 = 2 8 × 3 + 1 3
2 5 7 7 = 4 9 6 × 5 + 9 7
5 9 4 7 3 = 8 1 2 8 × 7 + 2 5 7 7
So, the next number should be 3 3 5 5 0 3 3 6 × 1 1 + 5 9 4 7 3 = 3 6 9 1 1 3 1 6 9
P.S. Notice that 3,6,9 contains multiples of 3 and 169 is the square of 13 which is the number before it.