1,2,4,7,11,13,14,22,26,28,44,52,77,91,143,154,182,286,308,364,572,1001,2002,4004
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To find the prime factors, start dividing by the smallest prime, which is 2 4004 = 2*2002 4004 = 2*2*1001 1001 is odd so no more 2's. Not divisible by 3 or 5 either. Next try 7 1001 = 7*143 bingo! So 4004 = 2*2*7*143 143 not divisible by 7, so try 11: 143 = 11*13 bingo again Finally 4004 = 2*2*7*11*13 To get ALL the factors you have to find ALL the combinations of the primes. For instance 2*7*11 = 154 is one such combination that yields one of the factors of 4004. There are too many to list.
4,084,080.
It is: 3994+10 = 4004
4.004 = 4004/1000 = 1001/250
1001, 2002, 3003, 4004, 5005, 6006, 7007, 8008, 9009, 10010, . . .