its expanded form, lists all three-digit numbers in order except 998. 998,991 = highest triangular number with 6 digits and the 1,413th triangular number 999,983 = largest 6-digit prime number 999,999 = repdigit. Rational numbers with denominators 7 and 13 have 6-digit repetends when expressed in decimal form, because 999999 is the smallest number one less than a power of 10 that is divisible by 7 and by 13, largest number in English not containing the letter 'l' in its name. Prime numbers Increments of 105 from zero through a million have the following prime counts: 9,592 primes between 0 and 100,000. 99,991 is the largest prime number less than 100,000. 8,392 primes between 100,000 and 200,000. This is a difference of 1,200 primes from the previous range. 104,729 is the 10,000th prime in this range. 199,999 is prime. 8,013 primes between 200,000 and 300,000. A difference of 379 primes from the previous range. 224,737 is the 20,000th prime. 7,863 primes between 300,000 and 400,000. A difference of 150 primes from the previous range. 350,377 is the 30,000th prime. 7,678 primes between 400,000 and 500,000. A difference of 185 primes from the previous range. Here, the difference increases by a count of 35. 479,909 is the 40,000th prime. 7,560 primes between 500,000 and 600,000. A difference of 118 primes from the previous range. 7,560 is the twentieth highly composite number. 599,999 is prime. 7,445 primes between 600,000 and 700,000. A difference of 115 primes from the previous range. 611,953 is the 50,000th prime. 7,408 primes between 700,000 and 800,000. A difference of 37 primes from the previous range. 700,001 and 799,999 are both prime. 746,773 is the 60,000th prime. 7,323 primes between 800,000 and 900,000. A difference of 85 primes from the previous range. Here, the difference increases by a count of 48. 882,377 is the 70,000th prime. 7,224 primes between 900,000 and 1,000,000. A difference of 99 primes from the previous range. The difference increases again, by a count of 14. 900,001 is prime. In total, there are 68,906 prime numbers between 100,000 and 1,000,000. Notes References Integers