22 votes
Accepted

Find the lower 8-digits number such that

Solution (0 allowed) Reasoning Solution (0 disallowed) Reasoning
  • 130k
11 votes
Accepted

Numbers whose product of digits is a multiple of sum of digits

Three numbers Observe that: Moreover: So we can start by finding... At this point it is worth noting that: So we search and find that Now observe that: So: With this much flexibility for ...
  • 749
6 votes

Important Alien Message

Not an answer. Alphabetic transcription of alien writing: QBADFAHGCAEBACDABEA FIJCHAEGADFAIEAAHA DGBACAFEILIAGADBAAA AAAFCEADHAGBNEAIFAB HDGAIEFAGCHAFADMEF AHCABIADACHEGADBAO AHDACFIEAHDBAGEIAH ...
  • 1,208
6 votes
Accepted

Equilibrium of differences

(NB: I've chosen to interpret "the four numbers Alice chooses must be non-repeatable" as "Alice cannot choose the same digit more than once". There are other possible ...
  • 71.5k

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