cp's OEIS Frontend

A249805 a(n+1) is the next smallest nontrivial cube beginning with a(n), initial term is 5.

%I A249805 #34 May 22 2025 10:21:41
%S A249805 5,512,5124031424,5124031424891652800051720000001
%N A249805 a(n+1) is the next smallest nontrivial cube beginning with a(n), initial term is 5.
%C A249805 a(5) is a 94-digit number. - _Jon E. Schoenfield_, Dec 04 2014
%H A249805 Jon E. Schoenfield, <a href="/A249805/b249805.txt">Table of n, a(n) for n = 1..7</a>
%o A249805 (Python)
%o A249805 def f(x):
%o A249805   n = x
%o A249805   s = 1
%o A249805   while s < 10**7:
%o A249805     if s % 10:
%o A249805       S = str(s**3)
%o A249805       if S.startswith(str(n)):
%o A249805         print(s**3, end=', ')
%o A249805         n = s**3
%o A249805     s += 1
%o A249805 f(5)
%o A249805 (PARI) a(n)=k=n; s=1; while(s<10^7, if(s%10, if(s^3\(10^(#Str(s^3)-#Str(k)))==k, print1(s^3, ", "); k=s^3)); s++)
%o A249805 a(5)
%Y A249805 Cf. A249895, A249799, A249804, A249828, A249834.
%K A249805 nonn,base
%O A249805 1,1
%A A249805 _Derek Orr_, Dec 03 2014
%E A249805 a(4) from _Jon E. Schoenfield_, Dec 04 2014