ID NAME QUALITY USERS ACC % DIFFICULTY C I
42 Adding Reversed Numbers   54 41489
6
4
25942 Ball sum   32 1043
11
11
30826 Bernoulli numbers   2 3
17
17
24998 PLAYING WITH BITS   24 493
14
14
17921 XOR   -10 3358
1
1
18294 Problem1   45
26314 Corn Headache   5 225
8
6
27269 Cube Numbers   23 449
9
11
22403 Divisors of factorial   43 1005
15
15
27299 Find Log   1 57
1
1
25311 Candies   3 740
6
8
32445 COUNT JUMPS   3 51
6
1
25583 Easy Odd Sum   2 849
3
3
31 Fast Multiplication   29 3446
14
13
16272 Nanoworld   8
25008 New Currency Shopping   1 3
34
17
15708 Divisibility   6 3590
6
5
17104 Fun with Sequences (Act 3)   1 785
1
1
17126 Fun with Sequences (Act 4)   2 421
1
1
17481 Fun with Sequences (Act 5)   322
1
1
18011 Fun with Sequences (Act 6)   415
1
1
18012 Fun with Sequences (Act 7)   352
1
1
176 Sum of one-sequence   4 612
1
23
22455 SUM OF PRODUCT   27 769
20
20
235 Very Fast Multiplication   7 618
32
21

#simple-math

The problem involves but simple mathematical concepts like arithmetic operations

http://www.basic-mathematics.com