1020, 1040 and 1060
Three numbers.
1000
They are 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, and 5000.
64 is one possible answer.
Do a search on Google, for "prime numbers" table, or "prime numbers" list, and you will surely find something.I cannot tell precisely without looking up a table or doing some longish calculus but as a gross estimatation there should be about this many prime numbers between 1000 and 2000:2000 / ln(2000) - 1000 / ln(1000) =~ 263 - 144 = 119Actual number of primes between 1000 and 2000 should be a little above 119(in the range [140, 160] i think)
Three numbers.
The multiples of 1,000 are an infinite number of integers in the set that begins 1000, 2000, 3000, 4000, and so on.
They are: 9/1000 itself and its equivalent fractions such as 18/2000
1000, 2000, 3000, 4000, 5000
500, 1000, 1500, 2000, 2500
They are: 500, 1000, 1500, 2000 . . .
500, 1000, 1500, 2000, 2500, 3000, 3500 . . .500, 1000, 1500, 2000, 2500, 3000, 3500 . . . to infinity.
All numbers that are divisible by 5 and 9 are multiples of their lcm which is 45. So the question boils down to which multiples of 45 are between 1000 & 2000. 1000 ÷ 45 = 222/9 2000 ÷ 45 = 444/9 Thus the solution is the multiples of 45 from 23 to 44 which are: 1035, 1080, 1125, 1170, 1215, 1260, 1305, 1350, 1395, 1440, 1485, 1530, 1575, 1620, 1665, 1710, 1755, 1800, 1845, 1890, 1935, 1980
1000
1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 11000, . . .
200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, . . .
500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, . . .