cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A382897 a(n) = n / A382895(n).

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%I A382897 #14 Jul 17 2025 09:04:01
%S A382897 1,2,3,4,5,6,7,8,9,1,1,2,1,1,5,1,1,1,1,2,1,2,1,8,5,2,1,2,1,3,1,2,3,1,
%T A382897 5,18,1,1,3,4,1,2,1,4,5,1,1,4,1,5,1,2,1,1,5,1,1,1,1,6,1,2,3,4,5,6,1,1,
%U A382897 1,7,1,2,1,1,5,1,7,1,1,8,1,2,1,4,5,1,1,8,1,9,1,2,3,1,5,6,1,1,9
%N A382897 a(n) = n / A382895(n).
%H A382897 Seiichi Manyama, <a href="/A382897/b382897.txt">Table of n, a(n) for n = 1..10000</a>
%o A382897 (Ruby)
%o A382897 def A(n)
%o A382897   m = n
%o A382897   n.to_s.split('').map(&:to_i).each{|i|
%o A382897     m /= i if i != 0 && m % i == 0
%o A382897   }
%o A382897   n / m
%o A382897 end
%o A382897 def A382897(n)
%o A382897   (1..n).map{|i| A(i)}
%o A382897 end
%o A382897 p A382897(100)
%o A382897 (Python)
%o A382897 def A(n):
%o A382897     m = n
%o A382897     for i in map(int, str(n)):
%o A382897         if i != 0 and m % i == 0:
%o A382897             m //= i
%o A382897     return n // m
%o A382897 def A382897(n):
%o A382897     return [A(i) for i in range(1, n + 1)]
%o A382897 print(A382897(100))
%Y A382897 Cf. A051801, A382895.
%K A382897 nonn,base,easy
%O A382897 1,2
%A A382897 _Seiichi Manyama_, Apr 08 2025