ID NAME QUALITY USERS ACC % DIFFICULTY C I
42 Adding Reversed Numbers   68 45432
6
5
25942 Ball sum   32 1232
12
12
30826 Bernoulli numbers   3 5
23
12
24998 PLAYING WITH BITS   29 549
13
13
17921 XOR   -15 3951
1
1
18294 Problem1   50
1
1
26314 Corn Headache   4 262
8
6
34620 Crying Series   1 28
1
6
27269 Cube Numbers   24 510
9
11
22403 Divisors of factorial   49 1176
15
14
27299 Find Log   1 74
1
1
25311 Candies   3 819
6
7
32445 COUNT JUMPS   2 61
6
1
25583 Easy Odd Sum   3 982
2
2
31 Fast Multiplication   37 3997
14
14
16272 Nanoworld   1 31
17
17
25008 New Currency Shopping   1 6
34
17
15708 Divisibility   10 4265
5
4
17104 Fun with Sequences (Act 3)   1 963
1
1
17126 Fun with Sequences (Act 4)   2 526
1
1
17481 Fun with Sequences (Act 5)   385
1
1
18011 Fun with Sequences (Act 6)   481
1
1
18012 Fun with Sequences (Act 7)   404
1
1
176 Sum of one-sequence   4 618
1
21
22455 SUM OF PRODUCT   27 821
19
20
235 Very Fast Multiplication   16 755
28
22

#simple-math

The problem involves but simple mathematical concepts like arithmetic operations

http://www.basic-mathematics.com