

A103463


Length of the largest lefttruncatable prime (in base n).


4



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
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OFFSET

2,2


COMMENTS

The next term (base 30) will be difficult to calculate because there are over a trillion lefttruncatable primes in that base for each of digitlengths 2934. Nevertheless, the largest lefttruncatable prime in this base can be estimated by theory to have a length of about 82. [Hans Havermann, Aug 16 2011]


REFERENCES

Angell, I. O.; Godwin, H. J.: On Truncatable Primes. Mathematics of Computation vol. 31 (1977), no. 137, pp. 265267.


LINKS

Table of n, a(n) for n=2..29.
Index entries for sequences related to truncatable primes
Martin Renner, Table of n, a(n) for n = 2..53 (with some question marks)
Eric Weisstein: Truncatable Prime.


CROSSREFS

Cf. A076623, A103443.
Sequence in context: A238775 A269525 A036252 * A265026 A223048 A181372
Adjacent sequences: A103460 A103461 A103462 * A103464 A103465 A103466


KEYWORD

nonn,base


AUTHOR

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


EXTENSIONS

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


STATUS

approved



