101
Two of them.
1100
There are infinitely many perfect numbers so they cannot all be listed.
1111 is the only one.
There is no way to determine the amount of perfect numbers there are. The number could be infinite, but this has yet to be proven. It has also yet to be proven if there are any odd perfect numbers.
There are two perfect numbers, 6 and 28, that are less than 100.
8924 is the number that comes 1100 numbers after 7824.
1100
Three numbers.
There are uncountably infinitely many real numbers between 1080 and 1100. There are 21 integers between 1080 and 1100, including the "endpoints." They are: 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1100.
1000, 1020, 1040, 1060, 1080, and 1100
There are 31 perfect square numbers between 1 and 1000 (including 1).
25