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A perfect number, such as 6, is a number that equal the sum of its proper divisors. So for 6 those are 1,2 and 3. The sum of 1+2+3=6. The first four perfect numbers are: 6, 28, 496, 8128 It is worth noting that perfect numbers are pretty rare. Look how far apart the 3 and 4th one are. This pattern continues and the distance between the 4 and 5 large as well! Here are the first 4 again and a few more so you can appreciate how far apart they are after the first 3. 6, 28, 496, 8128, 33550336, 8589869056, 137438691328, 2305843008139952128, 2658455991569831744654692615953842176, 191561942608236107294793378084303638130997321548169216
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Is the number 42 a perfect number?
No, it is not a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.
The prime factors of a number are the first four prime numbers No factor is repeated What is the number?
210 is the number whose prime factors are the first four primes unrepeated.
What are the first four numbers of a Visa card?
The first number is 4 for all visa cards. Rest of the numbers are based on the issuing bank, the routing number for the bank, the account number etc.
When is the number divisible by 11?
The list of numbers that are divisible by 11 is infinite. The first four are: 11,22,33,44 . . .
What is the smallest perfect square that is divisible by the four smallest prime numbers?
44,100
