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A023731 Numbers with exactly two 2's in base 5 expansion. 2

%I #13 Feb 13 2022 11:43:44

%S 12,37,52,57,60,61,63,64,67,72,87,112,137,162,177,182,185,186,188,189,

%T 192,197,212,237,252,257,260,261,263,264,267,272,277,282,285,286,288,

%U 289,292,297,300,301,303,304,305,306,308,309

%N Numbers with exactly two 2's in base 5 expansion.

%H Vincenzo Librandi, <a href="/A023731/b023731.txt">Table of n, a(n) for n = 1..3000</a>

%t Select[ Range[ 325 ], (Count[ IntegerDigits[ #, 5 ], 2 ]==2)& ]

%t Select[Range[400],DigitCount[#,5,2]==2&] (* _Harvey P. Dale_, Feb 13 2022 *)

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_

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Last modified July 20 06:10 EDT 2024. Contains 374441 sequences. (Running on oeis4.)