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Birthday problem
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===Everyone shares a birthday=== The strong birthday problem asks for the number of people that need to be gathered together before there is a 50% chance that ''everyone'' in the gathering shares their birthday with at least one other person. For d=365 days the answer is 3,064 people.<ref>DasGupta, Anirban. "The matching, birthday and the strong birthday problem: a contemporary review." Journal of Statistical Planning and Inference 130.1-2 (2005): 377-389.</ref><ref>Mario Cortina Borja, The Strong Birthday Problem, Significance, Volume 10, Issue 6, December 2013, Pages 18β20, https://doi.org/10.1111/j.1740-9713.2013.00705.x</ref> The number of people needed for arbitrary number of days is given by {{OEIS|A380129}}
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