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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Decode below rebus
D
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If all the below statements are true

1. Gianni was either in Italy or France in 1997.
2. If Gianni did not kill Versace, Hilton must have killed him.
3. If Versace died of suffocation, then either Gianni killed him or Versace committed suicide.
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5. Versace died of suffocation, but he did not kill himself.

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A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
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* The first number is one less than twice the second number.
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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.