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Timeline for The n-th number open problems

Current License: CC BY-SA 4.0

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Jun 14 at 8:16 comment added Henry The On-Line Encyclopedia of Integer Sequences (OEIS) has several thousand sequences with the keywords "hard" and "more"
Jun 14 at 8:16 comment converted from answer Kolakoski54 A good way to find such sequences is to check the OEIS: sequences with the keywords more, hard and bref can give you great examples!
Jun 14 at 8:11 comment added Kolakoski54 Another one is Van der Waerden numbers : en.wikipedia.org/wiki/Van_der_Waerden_number
Jun 14 at 8:10 comment added Vezen BU One example I think of is Kissing Number en.wikipedia.org/wiki/Kissing_number
Jun 14 at 7:50 history asked Bertrand Haskell CC BY-SA 4.0