USING: kernel math ranges project-euler.common sequences ;
IN: project-euler.092
-! https://projecteuler.net/index.php?section=problems&id=92
+! https://projecteuler.net/problem=92
! DESCRIPTION
! -----------
-! A number chain is created by continuously adding the square of the digits in
-! a number to form a new number until it has been seen before.
+! A number chain is created by continuously adding the square of
+! the digits in a number to form a new number until it has been
+! seen before.
! For example,
! 44 -> 32 -> 13 -> 10 -> 1 -> 1
! 85 -> 89 -> 145 -> 42 -> 20 -> 4 -> 16 -> 37 -> 58 -> 89
-! Therefore any chain that arrives at 1 or 89 will become stuck in an endless
-! loop. What is most amazing is that EVERY starting number will eventually
-! arrive at 1 or 89.
+! Therefore any chain that arrives at 1 or 89 will become stuck
+! in an endless loop. What is most amazing is that EVERY
+! starting number will eventually arrive at 1 or 89.
! How many starting numbers below ten million will arrive at 89?