Only the multiples of 1000.
Two prime numbers, 61 and 67, are the only prime numbers between 60 and 70.
1111 is the only one.
Only one . . . 101 .
Only two prime numbers lie between 50 and 60. They are 53 and 59.
Only the multiples of 1000.
The only one is 1,009.
It's the same as doing 1 to 200; only that you start at 1001 and end at 1200. In that case, the awnser is 💯.
1,3,5,7,9,11,13,15,17,19,31,33,35,37,39,51,53,55,57,59,71,73,75,77,079, 91,93,95,97,99,111,113,115,117,119,131,133,135,137,139,151,153,155, 157,159,171,173,175,177,179,191,193,195,197,199,311,313,315,317,319, 331,333,335,337,339,351,353,355,357,359,371,373,375,377,379,391,393, 395,397,399,511,513,515,517,519,531,533,535,537,539,551,553,555,557, 0559,571,573,575,579,591,593,595,597,599,711,713,715,717,719,731,733, 735,737,739,751,753,755,757,759,771,773,775,777,779,791,793,795,797, 799,911,913,915,917,919,931,933,935,937,939,951,953,955,957,959,971, 973,975,977,979,991,993,995,997,999
There are infinitely many numbers between any two numbers. But there are only 9 integers between them.
How many
The numbers 23 and 29 are the only prime numbers between 20 and 30
every number is unique and equal only to itself. The only number that is equal to 1000 is 1000.
Two prime numbers, 61 and 67, are the only prime numbers between 60 and 70.
1024, 2048, 4096 and 8192
The only integer with this property is 31. There are infinitely and uncountably many such non-integral numbers, within the open interval between 30 and 31.6.
1111 is the only one.