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Results tagged with number-sequence
Search options questions only
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user 8874
A puzzle in which the hidden pattern behind a given sequence of numbers (and, often, the next term) is to be found. Use with [sequence]
7
votes
2
answers
440
views
Four indeed is cosmic!
This puzzle deals with positive integers in decimal representation.
From every integer you can move to one or two or three other integers.
The allowed moves for integer $n\ge1$ are as follows:
You …
- 45.9k
33
votes
1
answer
2k
views
Professor Halfbrain and the sum of the digits of all divisors
Yesterday I met professor Halfbrain in the city. The professor looked tired and somewhat exhausted. He told me that he had spent his nights and days with adding up digits of divisors of positive integ …
- 45.9k