Humble Number

1 , 13 , 97 , 2577 , 59473 , ? \large 1, 13, 97, 2577, 59473, ?


The answer is 369113169.

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1 solution

Mohammad Farhat
Sep 3, 2018

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 = 13 eg. 6 \times 2 + 1 = 13 where 6 6 is the 1 s t 1^{st} even perfect number and 2 2 is the 1 s t 1^{st} prime number and where 1 1 is the previous term.

According to the formula (for deriving even perfect numbers), If 2 p 1 2^p -1 is prime then ( 2 p 1 ) ( 2 p 1 ) (2^p-1)(2^{p-1}) is (an even) perfect. So applying this formula, the next even perfect numbers are 28 , 496 , 8128 , 33550336 28, 496, 8128, 33550336 . (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 \huge crazy )

Allow me to demonstrate the numbers in the question:

97 = 28 × 3 + 13 97 = 28 \times 3 + 13

2577 = 496 × 5 + 97 2577 = 496 \times 5 + 97

59473 = 8128 × 7 + 2577 59473 = 8128 \times 7 + 2577

So, the next number should be 33550336 × 11 + 59473 = 369113169 33550336 \times 11 + 59473 = 369113169

P.S. Notice that 3,6,9 contains multiples of 3 and 169 is the square of 13 which is the number before it. \large \text {P.S. Notice that 3,6,9 contains multiples of 3 and 169 is the square of 13 which is the number before it.}

Wow man, how did you come up with the question? Glad for Singapoor, that would definitely take over all developed countries (with geniuses like you).

A Former Brilliant Member - 2 years, 7 months ago

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I am an Indian who migrated to Singapore. I just mashed simple concepts up that is why this is level 2

Mohammad Farhat - 2 years, 7 months ago

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