A055241 Smallest base in which n is not divisible by any of its digits (0 if no such base).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 5, 0, 0, 0, 5, 0, 5, 0, 8, 6, 5, 0, 7, 7, 10, 0, 6, 0, 7, 9, 7, 6, 4, 0, 7, 7, 7, 11, 7, 0, 4, 12, 16, 7, 4, 0, 9, 11, 9, 9, 5, 10, 8, 10, 10, 9, 4, 0, 8, 8, 11, 11, 5, 14, 5, 9, 9, 11, 9, 13, 5, 10, 11, 10, 5, 10, 5, 11, 11, 11, 10, 15, 5, 10, 10, 13, 5, 19

Offset

1,11

Links

Table of n, a(n) for n=1..90.

Example

a(11)=4 because it is written as 111111111111 in base 1, 1011 in base 2, 102 in base 3 and 23 in base 4; 11 is divisible by 1 but not by 2 or 3

Crossrefs

Cf. A055238-A055242.

Sequence in context: A103638 A129821 A126836 * A055242 A200295 A352167

Adjacent sequences: A055238 A055239 A055240 * A055242 A055243 A055244

Keyword

base,nonn

Author

Henry Bottomley, May 04 2000

Status

approved