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Thanks @H.PWiz for -2 bytes!
-2
Σ∫
Try it online!
Σ -- sum all ∫ -- prefix sums
Thanks @H.PWiz for -12 bytebytes!
-12
Σ∫dΣ∫
Try it online!Try it online!
Thanks @H.PWiz for -1 byte!
-1
Σ∫d
ṁΣḣd
Actually ΣΣḣd would work too, then the secondThanks @H.PWiz for Σ-1 would join the list.byte!
ΣΣḣd
Σ-1
d -- convert N to list of digits ḣ -- list with all prefixes ṁ -- map and sum the result Σ -- sumΣ∫d
Actually ΣΣḣd would work too, then the second Σ would join the list.
Σ
d -- convert N to list of digits ḣ -- list with all prefixes ṁ -- map and sum the result Σ -- sum
