Here are the ones that are less than 100,000:
5, 14, 23, 32, 41, 50, 104, 113, 122, 131, 140, 203, 212, 221, 230, 302, 311, 320, 401, 410, 500, 1004, 1013, 1022, 1031, 1040, 1103, 1112, 1121, 1130, 1202, 1211, 1220, 1301, 1310, 1400, 2003, 2012, 2021, 2030, 2102, 2111, 2120, 2201, 2210, 2300, 3002, 3011, 3020, 3101, 3110, 3200, 4001, 4010, 4100, 5000, 10004, 10013, 10022, 10031, 10040, 10103, 10112, 10121, 10130, 10202, 10211, 10220, 10301, 10310, 10400, 11003, 11012, 11021, 11030, 11102, 11111, 11120, 11201, 11210, 11300, 12002, 12011, 12020, 12101, 12110, 12200, 13001, 13010, 13100, 14000, 20003, 20012, 20021, 20030, 20102, 20111, 20120, 20201, 20210, 20300, 21002, 21011, 21020, 21101, 21110, 21200, 22001, 22010, 22100, 23000, 30002, 30011, 30020, 30101, 30110, 30200, 31001, 31010, 31100, 32000, 40001, 40010, 40100, 41000 & 50000.
There are 252 such numbers.
28
20. 16 without repeating a digit.
There are no positive integers less than any negative ones.
3, 2, 1
6
28
-48
First, separate the negative and positive integers (put them into two separate groups). If there is a zero, you can put it in its own group - or put it into the same group with the positive integers. Negative integers come first, then zero, then positive integers.For positive integers:An integer with less digits comes before an integer with more digits.For integers with the same number of digits, look at the first digit. The integer with the smaller digit in this position comes first.If the first digit is the same, look at the second digit. If those are equal, look at the third digit, etc.For negative integers, it is the other way round - for example, an integer with MORE digits comes first.
The set of positive odd integers.
There are 13.
100000
999999
20. 16 without repeating a digit.
The sum of the first positive odd integers less than 101 is 10,000.
the negative integers are below 0, for example -6.
There are 44 positive integers less than 2,010 that have an odd number of factors.
Positive integers are greater than zero. Negative integers are less than zero.