%I #26 Feb 28 2023 05:35:23

%S 0,3,6,6,17,7,15,10,24,9,32,8,26,22,25,11,43,14,37,27,37,17,53,20,39,

%T 28,46,19

%N Length of the largest left-truncatable prime (in base n).

%C The next term (base 30) will be difficult to calculate because there are over a trillion left-truncatable primes in that base for each of digit-lengths 29-34. Nevertheless, the largest left-truncatable prime in this base can be estimated by theory to have a length of about 82. [_Hans Havermann_, Aug 16 2011]

%H I. O. Angell and H. J. Godwin, <a href="http://dx.doi.org/10.1090/S0025-5718-1977-0427213-2">On Truncatable Primes</a>, Math. Comput. 31, 265-267, 1977.

%H Roman Maeder, <a href="https://community.wolfram.com/groups/-/m/t/1569707">A Prime Pencil</a>

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

%H <a href="/index/Tri#tprime">Index entries for sequences related to truncatable primes</a>

%Y Cf. A076623, A103443.

%K nonn,base,more

%O 2,2

%A _Martin Renner_, Mar 21 2005, Feb 20 2008, Apr 20 2008

%E a(24)-a(29) from _Hans Havermann_, Aug 16 2011