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A165330 Result of repeatedly replacing a number with the sum of the cubes of its digits until a fixed point or cycle is reached. 17

%I #8 Apr 14 2020 15:40:13

%S 0,1,371,153,133,371,153,370,371,153,1,371,153,133,371,153,217,371,

%T 153,370,371,153,217,371,153,133,371,153,133,371,153,133,371,153,370,

%U 371,153,370,371,153,133,371,153,370,371,153,133,407,153,1459,371,153,133

%N Result of repeatedly replacing a number with the sum of the cubes of its digits until a fixed point or cycle is reached.

%C Range = A046156;

%C A055012(A031179(n)) = A031179(n);

%C A055012(A055012(A165336(n)))=A165336(n) or A055012(A055012(A055012(A165336(n))))=A165336(n);

%C for n>0: a(n) = 153 iff n mod 3 = 0, see A008585; a(A165340(n,k))=153, 0<=k<=n;

%C a(n) = 371 or a(n) = 407 iff n mod 3 = 2, see A016789.

%H R. Zumkeller, <a href="/A165330/b165330.txt">Table of n, a(n) for n = 0..20000</a>

%Y Cf. A031179.

%K base,nonn

%O 0,3

%A _Reinhard Zumkeller_, Sep 17 2009

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Last modified April 24 13:41 EDT 2024. Contains 371957 sequences. (Running on oeis4.)