A228774 Numbers n such that the digits of n, once written in base 16, are only the hexadecimal digits A to F.

10, 11, 12, 13, 14, 15, 170, 171, 172, 173, 174, 175, 186, 187, 188, 189, 190, 191, 202, 203, 204, 205, 206, 207, 218, 219, 220, 221, 222, 223, 234, 235, 236, 237, 238, 239, 250, 251, 252, 253, 254, 255, 2730, 2731, 2732, 2733, 2734, 2735, 2746, 2747, 2748

Offset: 0

Author

Jean-François Alcover, Sep 04 2013

Keywords

• nonn
• base
• easy

Examples

			2989 is BAD in base 16.
		

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A055645, A132675, A132676, A140969, A187829.

Programs

Mathematica

FromDigits[#, 16]& /@ Flatten[Table[Tuples[Range[10, 15], k], {k, 1, 3}], 1]
Select[Range[3000], Min[IntegerDigits[#, 16]] > 9 &] (* T. D. Noe, Sep 04 2013 *)

PARI

a(n)=my(d);while(n>=6^(d+1),n-=6^d++);sum(i=0,d,((n\6^i)%6+10)<<(4*i)) \\ Charles R Greathouse IV, Sep 04 2013