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A045620 Numbers k such that digits of k^3 include digits of k^2. 1

%I #19 Apr 03 2023 18:23:41

%S 0,1,5,10,25,50,65,100,146,250,405,500,510,521,615,650,768,945,965,

%T 1000,1004,1040,1050,1085,1126,1145,1203,1216,1219,1222,1452,1460,

%U 1476,1480,1482,1638,1706,1878,2002,2020,2199,2204,2260,2276,2326,2450,2470,2476

%N Numbers k such that digits of k^3 include digits of k^2.

%e a(8) = 146 because 146^3 = 3112136 includes all digits of 146^2 = 21316.

%o (Python)

%o from itertools import count, islice

%o from collections import Counter

%o def A045620_gen(startvalue=0): # generator of terms >= startvalue

%o return filter(lambda k:Counter(str(m:=k**2))<=Counter(str(k*m)),count(max(startvalue,0)))

%o A045620_list = list(islice(A045620_gen(),20)) # _Chai Wah Wu_, Apr 03 2023

%Y Cf. A029772, A046827, A046829.

%K easy,nonn,base

%O 1,3

%A _Erich Friedman_

%E Edited by _N. J. A. Sloane_, Nov 01 2007, at the suggestion of _Alexander R. Povolotsky_

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Last modified April 18 15:05 EDT 2024. Contains 371780 sequences. (Running on oeis4.)