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The challenge involves mathematics. Also consider using more specific tags: [number] [number-theory] [arithmetic] [combinatorics] [graph-theory] [geometry] [abstract-algebra].

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If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. For a given input n, find the sum of multiples of 3 or five between 1 …
asked Nov 4 '18 by Eduardo Hoefel
1
vote
JAEL, 13 10 bytes #&àĝ&oȦ Try it online! Explanation (generated automatically): ./jael --explain '#&àĝ&oȦ' ORIGINAL CODE: #&àĝ&oȦ EXPANDING EXPLANATION: à => `a ĝ => ^g Ȧ => .a! EXPANDED CODE: …
answered Nov 4 '18 by Eduardo Hoefel
15
votes
40answers
The sum of the squares of the first ten natural numbers is, \$1^2 + 2^2 + \dots + 10^2 = 385\$ The square of the sum of the first ten natural numbers is, \$(1 + 2 + ... + 10)^2 = 55^2 = 3025\$ Henc …
asked Nov 4 '18 by Eduardo Hoefel
2
votes
JAEL, 18 bytes ![ؼw>î?èÛ|õÀ Try it online!
answered Nov 4 '18 by Eduardo Hoefel
1
vote
JAEL, 9 7 bytes Changing the diacritics from one character to another gave me 1 byte Still working on SBCS encoding. #`&@uȦ Explanation (generated automatically): ./jael -u explain '#`&@uȦ' ORI …
answered Nov 7 '18 by Eduardo Hoefel
14
votes
28answers
I think the Collatz Conjecture is already well-known. But what if we invert the rules? Start with an integer n >= 1. Repeat the following steps: If n is even, multiply it by 3 and add 1. If n is o …
asked Nov 4 '18 by Eduardo Hoefel
2
votes
05AB1E, 30 bytes U1V[YLO>X›iYLOX-UY<LO>X+,q}Y>V Try it online!
answered Apr 28 '17 by Eduardo Hoefel