

A209931


Numbers n such that smallest digit of all divisors of n is 1.


1



1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

Also numbers n such that smallest digit of concatenation of all divisors of n (A037278 or A176558) is 1.
Sequence is not the same as A052382, first deviation is at a(175): A052382(175) = 214, a(175) = 215.
Sequence is not the same as A067251, first deviation is at a(91): A067251 (91) = 101, a(91) = 111.
Complement of A209932.


LINKS

Table of n, a(n) for n=1..70.


EXAMPLE

Number 24 is in sequence because smallest digit of all divisors of 24 (1, 2, 4, 8, 3, 6, 12, 24) is 1.


CROSSREFS

Cf. A052382, A067251, A209929 (smallest digit of all divisors of n).
Sequence in context: A171397 A043095 A023804 * A067251 A052382 A055572
Adjacent sequences: A209928 A209929 A209930 * A209932 A209933 A209934


KEYWORD

nonn,base


AUTHOR

Jaroslav Krizek, Mar 20 2012


STATUS

approved



