

A134596


The largest ndigit primeval number A072857.


3



2, 37, 137, 1379, 13679, 123479, 1234679, 12345679, 102345679, 1123456789, 10123456789
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Former definition: The least ndigit number m (i.e., m >= 10^(n1)) which yields A076730(n) = the maximum, for m < 10^n, of A039993(m) = number of primes that can be formed using some or all digits of m.
A subsequence of A072857, consisting in the largest ndigit term of the latter, for n=1,2,3,....  M. F. Hasler, Mar 12 2014


LINKS

Table of n, a(n) for n=1..11.
M. Keith, Integers containing many embedded primes


FORMULA

a(n) = max { m in A072857, m < 10^n }.  M. F. Hasler, Mar 12 2014


CROSSREFS

Cf. A039993, A134597.
Sequence in context: A106947 A142077 A107182 * A139119 A053788 A078976
Adjacent sequences: A134593 A134594 A134595 * A134597 A134598 A134599


KEYWORD

nonn,base,more


AUTHOR

N. J. A. Sloane, Jan 25 2008


EXTENSIONS

Link fixed by Charles R Greathouse IV, Aug 13 2009
Definition reworded and values of a(6)a(11) added by M. F. Hasler, Mar 11 2014


STATUS

approved



