

A069575


Numbers n such that n contains the digit 0 in no base b with 2 < b < n.


4




OFFSET

1,1


COMMENTS

Probably finite.
The next term (if it exists) is > 10000000.  Larry Reeves (larryr(AT)acm.org), Oct 12 2003
The next term (if it exists) is > 100000000.  Michel Marcus, Jul 14 2013
The next term (if it exists) is > 10^400.  Nathan Fox, Mar 09 2016
Every term in this sequence other than 4 is prime.  Nathan Fox, Mar 09 2016
No more terms through 10^5000.  Jon E. Schoenfield, Oct 13 2018


LINKS

Table of n, a(n) for n=1..8.


PROG

(PARI) isok(n) = {for (b=3, n1, digs = digits(n, b); for (j=1, #digs, if (digs[j] == 0, return (0)); ); ); return (1); } \\ Michel Marcus, Jul 14 2013


CROSSREFS

Sequence in context: A139373 A293757 A275273 * A250182 A072215 A106170
Adjacent sequences: A069572 A069573 A069574 * A069576 A069577 A069578


KEYWORD

base,nonn


AUTHOR

Naohiro Nomoto, Apr 18 2002


EXTENSIONS

Corrected by Larry Reeves (larryr(AT)acm.org), Oct 12 2003


STATUS

approved



