ID NAME QUALITY USERS ACC % DIFFICULTY C I
42 Adding Reversed Numbers   51 40696
6
4
25942 Ball sum   29 992
11
11
30826 Bernoulli numbers   2 3
17
17
24998 PLAYING WITH BITS   24 481
14
14
17921 XOR   -11 3184
1
1
18294 Problem1   44
26314 Corn Headache   5 216
8
6
27269 Cube Numbers   23 440
9
11
22403 Divisors of factorial   41 979
14
14
27299 Find Log   2 52
1
1
25311 Candies   3 722
6
8
32445 COUNT JUMPS   3 50
6
1
25583 Easy Odd Sum   2 822
3
3
31 Fast Multiplication   29 3350
13
12
16272 Nanoworld   8
25008 New Currency Shopping   1 3
34
17
15708 Divisibility   6 3421
6
5
17104 Fun with Sequences (Act 3)   1 736
1
1
17126 Fun with Sequences (Act 4)   2 395
1
1
17481 Fun with Sequences (Act 5)   309
1
1
18011 Fun with Sequences (Act 6)   393
1
1
18012 Fun with Sequences (Act 7)   335
1
1
176 Sum of one-sequence   4 609
1
23
22455 SUM OF PRODUCT   27 751
20
20
235 Very Fast Multiplication   7 596
32
21

#simple-math

The problem involves but simple mathematical concepts like arithmetic operations

http://www.basic-mathematics.com