The Ultimate Confusing Sequence II

Level 4

1, 15, 40, 127, 156


The answer is 600.

Anish Harsha by Anish Harsha , 20, India

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1 solution

The given sequence is the sum of factors of cubes of natural numbers .

See this .

6 Helpful 0 Interesting 0 Brilliant 0 Confused

can you please explain it briefly??? @Azhaghu Roopesh M

AMAN KUMAR - 6 years, 2 months ago

For anyone that doesn't quite understand what this means, here's a brief explanation:

1 3 1^3 is equal to 1. The only factor of 1 is 1, and the sum of this is 1.

2 3 2^3 is 8. The factors of 8 are 1, 2, 4, and 8. The sum of these are 15 (1+2+4+8).

3 3 3^3 is 27. The factors of this are 1, 3, 9, and 27. The sum of these are 40 (1+3+9+27).

This pattern continues with the sum of the factors of 4 3 4^3 , 5 3 5^3 , ...

Jolon Behrent - 4 years, 12 months ago

Wow, ok then. Good job!

James Wilson - 3 years, 6 months ago

you' re right

Anish Harsha - 6 years, 4 months ago

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