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  1. a=->n,d=99{n*d>0?a[n,d-=2]-(2**d%d==2?d*(a[n/=d,d]+n*~n/2):0):0}
  2. p a[10**5],a[10**9]
Success #stdin #stdout 0.92s 7408KB
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3819368809
379681461860838017
https://ideone.com/t2wQHT
language:
Ruby (ruby 2.5.5)
created:
10 years ago
visibility:
secret

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