combinatoric selections (elegant with pascal triangle)
poker hands (record syntax, typeclass)
lychrel numbers (digits and unDigits)
powerful digit sum (powerful oneliner with effortless bigints)
square root convergents (Data.Ratio)
spiral primes (slow naive brute force)
xor decryption (naive with external dictionary)
xor decryption (elegant with frequency analysis)
prime pair sets (brute force)
cyclical figurative numbers (observations, maybe manip, nice)
cubic permutations (observation, Map.minView)
powerful digit counts (oneliner with simple math reduction)