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A140969 Prime numbers whose hexadecimal representation uses only the digits A,B,C,D,E,F (and not the decimal digits). 3

%I

%S 11,13,173,191,223,239,251,2731,2749,2767,2797,3019,3023,3037,3067,

%T 3259,3307,3323,3499,3517,3533,3547,3581,3583,3803,3821,3823,4013,

%U 4027,4079,4091,4093,43691,43711,43759,43951,43963,43997,44027,44029,44203,44207

%N Prime numbers whose hexadecimal representation uses only the digits A,B,C,D,E,F (and not the decimal digits).

%H Charles R Greathouse IV, Nov 16 2009, <a href="/A140969/b140969.txt">Table of n, a(n) for n = 1..10000</a>

%e 11=B 13=D 113=AD 131=BB

%o From _Michael B. Porter_, Dec 01 2009: (Start)

%o (PARI) mindigit(n,b) = if(n<b, n, min(mindigit(floor(n/b),b),n%b))

%o isA140969(n) = (isprime(n) && mindigit(n,16) > 9) (End)

%Y Cf. A238090.

%K base,nonn

%O 1,1

%A _Gil Broussard_, Jul 27 2008

%E Edited by _N. J. A. Sloane_, Nov 15 2009

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Last modified December 2 20:59 EST 2022. Contains 358510 sequences. (Running on oeis4.)