July 5, 2009 06:54pm pdt

1. Infinity08 317,562
2. mrjoltcola 152,926
3. ozo 96,977
4. jkr 92,139
5. evilrix 87,113
6. itsmeandn... 65,203
7. sunnycoder 52,945
8. Kdo 36,340
9. masheik 26,578
10. fridom 26,542
11. Let_Me_Be 25,560
12. DanRollins 21,537
13. ewest02 12,750
14. woolmilkp... 11,072
15. CSecurity 9,254
16. abel 8,976
17. lhl60 8,554
18. alb66 7,300
19. ravenpl 7,200
20. thehagman 6,932
21. khun 6,440
22. DeepuAbr... 6,280
23. climbgunks 5,820
24. ptupapers 5,500
25. HalfAsleep 5,494

1. Infinity08 1,471,822
2. sunnycoder 1,087,179
3. jkr 868,760
4. Kdo 861,467
5. ozo 563,404
6. grg99 299,356
7. evilrix 298,243
8. PaulCasw... 296,971
9. itsmeandn... 253,680
10. jaime_oliv... 216,392
11. fridom 201,638
12. brettmjohn... 182,528
13. ankuratvb 157,866
14. mrjoltcola 152,926
15. imladris 147,017
16. cwwkie 129,383
17. Axter 98,363
18. akshayxx 96,671
19. josgood 82,381
20. AlexViroc... 70,328
21. gj62 70,227
22. rbr 69,997
23. ssnkumar 61,996
24. rajeev_d... 61,729
25. efn 59,966

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5.0

weird number??

Asked by babyruth in C Programming Language

Tags: number

I stumble into a math problem yesterday..Weird Number.
One of my friend said that it's impossible to come up with the source code to generate the weird number because weird number is a unsolved maths mystery... but... i doubted him
so help me proved him wrong.....

here's somthing about weird number...

a weird number is an integer say...n for which:
1.the proper divisors of n sum to a number larger than n; and also
2.n cannot be expressed as the sum of a subset of its proper divisors.
As an example, consider n=12. The divisors are 1, 2, 3, 4, 6, and 12. The proper divisors of a number are the divisors of n exluding n itself. Thus the proper divisors of 12 are 1, 2, 3, 4, and 6. These sum to 16 so the first condition is satisfied. However, the second condition is not satisfied because:

12 = 1 + 2 + 3 + 6

so 12 can be expressed as the sum of a subset of its proper divisors. Therefore 12 is not a weird number.

For the case of n=70, the proper divisors of 70 are 1, 2, 5, 7, 10, 14, and 35. The first condition is satisfied becasuse these sum to 74, which is greater than 70. The second condition is satisfied because there is no subset of the proper divisors that sums to exactly 70. Therefore 70 is a weird number

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20090429-EE-VQP-58

weird number??

Asked by babyruth in C Programming Language

Tags: number

About this solution