A103463 Length of the largest left-truncatable prime (in base n).

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, 28, 46, 19

Offset: 2

Author

Martin Renner, Mar 21 2005, Feb 20 2008, Apr 20 2008

Keywords

• nonn
• base
• more

Comments

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]

Links

• I. O. Angell and H. J. Godwin, On Truncatable Primes, Math. Comput. 31, 265-267, 1977.
• Roman Maeder, A Prime Pencil
• Eric Weisstein's World of Mathematics, Truncatable Prime.
• Index entries for sequences related to truncatable primes

Crossrefs

Cf. A076623, A103443.

Extensions

a(24)-a(29) from Hans Havermann, Aug 16 2011