For The Mathematically Inclined

Problem 2

What is the next number of the sequence 1, 2, 6, 21, 88 ?

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Problems from 3/1/18

Problem 1

What is the smallest value of n for which 1+2+3+....n > 1000

Problem 2

What is the smallest value of n for which 1+2⁴+3⁴+...n⁴ > 100000

Congratulations to Avanish Gowrishankar who was the winner of the last set of puzzles.