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JavaScript (Node.js), 86 bytes f=(a,b=2,c=(a,b=2)=>a-b?a%b&&c(a,b+1):1,d=a=>c(++a)?a:d(a))=>!c(b)|d(b)-b<a?f(a,b+1):b Try it online!
Answer
#1: Initial revision
by
Hakerh400
·
2020-11-29T20:15:03Z (about 4 years ago)
# [JavaScript (Node.js)], 86 bytes
<!-- language-all: lang-javascript -->
f=(a,b=2,c=(a,b=2)=>a-b?a%b&&c(a,b+1):1,d=a=>c(++a)?a:d(a))=>!c(b)|d(b)-b<a?f(a,b+1):b
[Try it online!][TIO-ki3k7tm0]
[JavaScript (Node.js)]: https://nodejs.org
[TIO-ki3k7tm0]: https://tio.run/##bcrLCsIwEIXhvW/hwjJDEiH1SmuaZ5lJGlFKI1Zc@e6xgm5kNofDx3@lJ03hfrk9zJhjX0pyQJpdrcP3oOvIsKcVV1X4kLLYWB0duS6AUoSemgiEc7gMwPiK8xg@kU@/nEsb8jjloV8P@QwJLGK7@LNasI1gW8F2gu0FOwh2nK28AQ "JavaScript (Node.js) – Try It Online"