Logical Series

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.




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They each buy one thing each for the picnic.

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Olivia got the drink with the same letter as the one in her first name.
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Also Madison is allergic to cheese.

So which ladies bought what ?

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Amazing Facts

Challenging

There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.