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Numbers with exactly 3 0's in their base 5 expansion.
3

%I #12 Sep 14 2023 07:50:06

%S 125,250,375,500,626,627,628,629,630,635,640,645,650,675,700,725,750,

%T 875,1000,1125,1251,1252,1253,1254,1255,1260,1265,1270,1275,1300,1325,

%U 1350,1375,1500,1625,1750,1876,1877,1878

%N Numbers with exactly 3 0's in their base 5 expansion.

%H Seiichi Manyama, <a href="/A023724/b023724.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[ Range[ 2000 ], (Count[ IntegerDigits[ #, 5 ], 0 ]==3)& ]

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_