A113017 - OEIS

%I #10 Nov 02 2023 23:41:56

%S 13,19,23,29,41,43,47,53,59,71,73,79,83,89,97,101,103,109,113,127,137,

%T 139,149,151,163,173,179,191,193,197,199,211,223,227,229,233,239,257,

%U 263,269,281,283,293,311,313,317,331,337,349,353,359,367,373,379,383

%N Primes that become composites when their decimal representation is interpreted duodecimally.

%H Robert Price, <a href="/A113017/b113017.txt">Table of n, a(n) for n = 1..26358</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Duodecimal.html">Duodecimal</a>

%e A000040(25)=97 -> 9*12^1+7*12^0=108+7=115=5*23.

%Y Cf. A000040, A002808, A113016, A102487.

%K nonn,base

%O 1,1

%A _Reinhard Zumkeller_, Oct 11 2005