Very sneaky noticing this pattern in the answers.
Project Euler: Problem 10, Sum of Primes
Remove NaN ?
Number of digits in an integer
Divisible by 10
Hexagonal numbers on a spiral matrix
Lights Out 3 - 5x5, 6 moves
Lights Out 1 - 5x5, 3 moves
Mersenne Primes vs. All Primes
Musical Note Interval 1 - Diatonic Scale
Self-similarity 1 - Every other term
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