this list of tasks I've implemented in october:
https://rosettacode.org/wiki/Pseudorandom_Number_Generator_Image#PicoLisp
https://rosettacode.org/wiki/Geohash#PicoLisp
https://rosettacode.org/wiki/Pseudo-random_numbers/Splitmix64#PicoLisp
https://rosettacode.org/wiki/Days_between_dates#PicoLisp
https://rosettacode.org/wiki/Esthetic_numbers#PicoLisp
https://rosettacode.org/wiki/Pseudorandom_Number_Generator_Image#PicoLisp
https://rosettacode.org/wiki/Pathological_floating_point_problems#PicoLisp
Last task is the most interesting.