Sequence Test

Hard level

This level has harder exercises, the answers will have at at most 4 digits. If you want to select which tests are used, you can set up a custom exercise.

Scoring

You get one point for every correct answer, unlike the math test there is no negative score.

Manual

The answer to the sequenence and it's explaination will be printed right next to it in the site's background color. You can use CTRL+A, Command+A or mouse select all to show it. Custom tests will offer more control over the test.

Questions
1) 5, 16, 38, 82, 170 346 (2 * previous + 6)
2) 10, 6, 14, -2, 18, -10, 22, -18, 26, -26, 30 -34 (odd=seq1, even=seq2; seq1: += 4, seq2: -= 8)
3) 9, 24, 69, 204, 609 1824 (3 * previous - 3)
4) 16, 24, 40, 72, 136 264 (2 * previous - 8)
5) 9, 4, 177147, 13, 32, 19683, 17, 256, 2187, 21, 2048, 243, 25, 16384, 27, 29, 131072 3 (seq1, seq2, seq3...; seq1: += 4, seq2: *= 8, seq3: /= 9)
6) 6, 2673, -3, 891, -12, 297, -21, 99, -30, 33, -39 11 (odd=seq1, even=seq2; seq1: -= 9, seq2: /= 3)
7) 3, 15, 15, 15, 75, 13, 75, 375, 11, 375, 1875, 9, 1875, 9375, 7, 9375, 46875 5 (seq1, seq2, seq3...; seq1: *= 5, seq2: *= 5, seq3: -= 2)
8) 6, 29, 121, 489, 1961 7849 (4 * previous + 5)
9) 11, 13, 16, 21, 28 39 (previous + next prime number)
10) 544, 4, 1, 272, 12, 2, 136, 36, 4, 68, 108, 8, 34, 324, 16, 17, 972 32 (seq1, seq2, seq3...; seq1: /= 2, seq2: *= 3, seq3: *= 2)
11) 16, 4, 18, 0, 20, -4, 22, -8, 24, -12, 26 -16 (odd=seq1, even=seq2; seq1: += 2, seq2: -= 4)
12) 163840, -4131, 32768, -20480, -1377, -4096, -2560, -459, -512, -320, -153, -64, -40, -51, -8, -5, -17 -1 (seq1, seq2, seq3...; even index has - before it; seq1: /= 8, seq2: /= 3, seq3: /= 8)
13) 8, 10, 13, 18, 25 36 (previous + next prime number)
14) 285719, -288, 10, -40817, -144, -12, -5831, -72, -14, -833, -36, -16, -119, -18, -18, -17, -9 -20 (seq1, seq2, seq3...; even index has - before it; seq1: /= 7, seq2: /= 2, seq3: += 2)
15) 9, -5, 236196, -8, -11, -26244, -7, -17, -2916, -6, -23, -324, -5, -29, -36, -4, -35 -4 (seq1, seq2, seq3...; even index has - before it; seq1: -= 1, seq2: += 6, seq3: /= 9)
16) 18750, 16, 14, 3750, 80, 20, 750, 400, 26, 150, 2000, 32, 30, 10000, 38, 6, 50000 44 (seq1, seq2, seq3...; seq1: /= 5, seq2: *= 5, seq3: += 6)
17) 7, 10, 49, 20, 343, 40, 2401, 80, 16807, 160, 117649 320 (odd=seq1, even=seq2; seq1: *= 7, seq2: *= 2)
18) 17, 6, 2, 25, 3, 6, 33, 0, 10, 41, -3, 14, 49, -6, 18, 57, -9 22 (seq1, seq2, seq3...; seq1: += 8, seq2: -= 3, seq3: += 4)
19) 15, 5, 9, 20, 3, 80, -3, 320, -9, 1280, -15 5120 (odd=seq1, even=seq2; seq1: -= 6, seq2: *= 4)
20) 6, 15, 14, 22, 22, 29, 30, 36, 38, 43, 46 50 (odd=seq1, even=seq2; seq1: += 8, seq2: += 7)
21) 8, 9, 13, 22, 38 63 (previous + ^2 of place in sequence)
22) 16, 17, 21, 30, 46 71 (previous + ^2 of place in sequence)
23) 15, 17, 20, 25, 32 43 (previous + next prime number)
24) 17, -14, 5, -26, -18, -8, -35, -22, -11, -44, -26, -14, -53, -30, -17, -62, -34 -20 (seq1, seq2, seq3...; even index has - before it; seq1: += 9, seq2: += 4, seq3: += 3)
25) 12, 3, 1, 20, 15, -8, 28, 75, -17, 36, 375, -26, 44, 1875, -35, 52, 9375 -44 (seq1, seq2, seq3...; seq1: += 8, seq2: *= 5, seq3: -= 9)


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