Sequence Test
Set up exercise

In practice mode the answers are selectable on the same page and no scoring will be done. In test mode you need to click a "Finished" button and your score will be calculated.

Start values
Biggest absolute number with which any + or - is done (>0).
Biggest absolute number with which any * or / is done (>1).

Answer & complexity
Guarantee for at least this many examples
(total # of digits)

Easy
Two operations, x and +/-

Medium
Mix of two operations, +, -, *, /

Hard

Specials and logic


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) 15, 20, -5, 25 -30 (Next is - of previous two)
2) B, D, F, H J (A=0, B=1, next element += 2 places)
3) 8, 18, 1118, 3118 132118 (Every following number describes the previous one; 111221 - One 1, One 2, Two 1s )
4) 2, 3, 5, 4 4 (Every term shows the number of letters in the English transcription of its number; 1, 3 (=one))
5) 7, -39366, 3888, -12, -4374, -648, -17, -486, -108, -22, -54, -18, -27, -6 -3 (seq1, seq2, seq3...; even index has - before it; seq1: += 5, seq2: /= 9, seq3: /= 6)
6) 2, 10, 1053, 3, 9, 351, 4, 8, 117, 5, 7, 39, 6, 6 13 (seq1, seq2, seq3...; seq1: += 1, seq2: -= 1, seq3: /= 3)
7) 4, 6, 9, 14 21 (previous + next prime number)
8) 19683, 12288, 2187, 1536, 243, 192, 27, 24, 3 3 (odd=seq1, even=seq2; seq1: /= 9, seq2: /= 8)
9) 486, 8, 162, 14, 54, 20, 18, 26, 6 32 (odd=seq1, even=seq2; seq1: /= 3, seq2: += 6)
10) 11, 12, 16, 25 41 (previous + ^2 of place in sequence)
11) 7, 8, 12, 21 37 (previous + ^2 of place in sequence)
12) 16, 11, 72171, 8, 13, 8019, 4, 15, 891, 2, 17, 99, 1, 19 11 (seq1, seq2, seq3...; seq1: /= 2, seq2: += 2, seq3: /= 9)
13) 12, 13122, 9, 17, 1458, 15, 22, 162, 21, 27, 18, 27, 32, 2 33 (seq1, seq2, seq3...; seq1: += 5, seq2: /= 9, seq3: += 6)
14) 3, 10, 31, 94 283 (3 * previous + 1)
15) 3, 13, 43, 133 403 (3 * previous + 4)
16) 5000, -8, 2, -1000, -17, -4, -200, -26, -6, -40, -35, -8, -8, -44 -10 (seq1, seq2, seq3...; even index has - before it; seq1: /= 5, seq2: += 9, seq3: += 2)
17) 9, 5, 2, 27, -2, -5, 81, -9, -12, 243, -16, -19, 729, -23 -26 (seq1, seq2, seq3...; seq1: *= 3, seq2: -= 7, seq3: -= 7)
18) 3, -13, 16, -9, -39, -8, -15, -117, -4, -21, -351, -2, -27, -1053 -1 (seq1, seq2, seq3...; even index has - before it; seq1: += 6, seq2: *= 3, seq3: /= 2)
19) 11, 13, 16, 21 28 (previous + next prime number)
20) 1, 6, 6, 36 216 (Next is * of previous two)
21) 5, 13, 29, 61 125 (2 * previous + 3)
22) 10, -8, 2816, -30, -56, -704, -90, -392, -176, -270, -2744, -44, -810, -19208 -11 (seq1, seq2, seq3...; even index has - before it; seq1: *= 3, seq2: *= 7, seq3: /= 4)
23) 7, 10, 16, 28 52 (2 * previous - 4)
24) 9, 10, 14, 23 39 (previous + ^2 of place in sequence)
25) 9, 1377, 11, 13, 459, 5, 17, 153, -1, 21, 51, -7, 25, 17 -13 (seq1, seq2, seq3...; seq1: += 4, seq2: /= 3, seq3: -= 6)


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