A134596 - OEIS

%I #23 Jun 16 2021 17:41:30

%S 2,37,137,1379,13679,123479,1234679,12345679,102345679,1123456789,

%T 10123456789

%N The largest n-digit primeval number A072857.

%C Former definition: The least n-digit number m (i.e., m >= 10^(n-1)) 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.

%C Subsequence of A072857 consisting of the largest terms of given length. - _M. F. Hasler_, Mar 12 2014

%H M. Keith, <a href="http://www.cadaeic.net/primeval.htm">Integers containing many embedded primes</a>

%F a(n) = max { m in A072857, m < 10^n }. - _M. F. Hasler_, Mar 12 2014

%o (PARI) A134596(n,A=A072857)=vecmax(select(t->logint(t,10)+1==n,A)) \\ where A072857 must comprise all n digit terms of that sequence. - _M. F. Hasler_, Oct 14 2019

%o (Python) # see linked program in A076449

%Y Cf. A039993, A072857, A076730, A134597, A076449.

%K nonn,base,more

%O 1,1

%A _N. J. A. Sloane_, Jan 25 2008

%E Link fixed by _Charles R Greathouse IV_, Aug 13 2009

%E Definition reworded and values of a(6)-a(11) added by _M. F. Hasler_, Mar 11 2014