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.

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) 1, 8, 3, 2, 9, -4, 27, -10, 81, -16, 243 -22 (odd=seq1, even=seq2; seq1: *= 3, seq2: -= 6)
2) 10, 11, 15, 24, 40 65 (previous + ^2 of place in sequence)
3) 6, -53125, 2, -8, -10625, -3, -10, -2125, -4, -12, -425, -5, -14, -85, -6, -16, -17 -7 (seq1, seq2, seq3...; even index has - before it; seq1: += 2, seq2: /= 5, seq3: += 1)
4) 6, 8, 11, 16, 23 34 (previous + next prime number)
5) 1, 2, 6, 15, 31 56 (previous + ^2 of place in sequence)
6) 2, 0, -4, -12, -28 -60 (2 * previous - 4)
7) 14, 40625, 56, 8125, 224, 1625, 896, 325, 3584, 65, 14336 13 (odd=seq1, even=seq2; seq1: *= 4, seq2: /= 5)
8) 117649, -11, 10240, -16807, -77, -2560, -2401, -539, -640, -343, -3773, -160, -49, -26411, -40, -7, -184877 -10 (seq1, seq2, seq3...; even index has - before it; seq1: /= 7, seq2: *= 7, seq3: /= 4)
9) 17, 8, 4, 26, 15, 16, 35, 22, 64, 44, 29, 256, 53, 36, 1024, 62, 43 4096 (seq1, seq2, seq3...; seq1: += 9, seq2: += 7, seq3: *= 4)
10) 285719, 3, 40817, 7, 5831, 11, 833, 15, 119, 19, 17 23 (odd=seq1, even=seq2; seq1: /= 7, seq2: += 4)
11) 1, 3, 3, 9, 27 243 (Next is * of previous two)
12) 2, 4, 7, 12, 19 30 (previous + next prime number)
13) 7, 9, -2, 11, -13 24 (Next is - of previous two)
14) 7, 3, 50421, 21, 9, 7203, 63, 15, 1029, 189, 21, 147, 567, 27, 21, 1701, 33 3 (seq1, seq2, seq3...; seq1: *= 3, seq2: += 6, seq3: /= 7)
15) 14, -1024, 14, -15, -256, -13, -16, -64, -12, -17, -16, -11, -18, -4, -10, -19, -1 -9 (seq1, seq2, seq3...; even index has - before it; seq1: += 1, seq2: /= 4, seq3: -= 1)
16) 6, 7, -1, 8, -9 17 (Next is - of previous two)
17) 13, 4, 5, 26, 28, 3, 52, 196, 1, 104, 1372, -1, 208, 9604, -3, 416, 67228 -5 (seq1, seq2, seq3...; seq1: *= 2, seq2: *= 7, seq3: -= 2)
18) 5, 15, 20, 30, 80, 60, 320, 120, 1280, 240, 5120 480 (odd=seq1, even=seq2; seq1: *= 4, seq2: *= 2)
19) 2430, 16, 151263, 810, 24, 21609, 270, 32, 3087, 90, 40, 441, 30, 48, 63, 10, 56 9 (seq1, seq2, seq3...; seq1: /= 3, seq2: += 8, seq3: /= 7)
20) 1, 7, 19, 43, 91 187 (2 * previous + 5)
21) 38880, 5, 2, 6480, 2, 10, 1080, -1, 18, 180, -4, 26, 30, -7, 34, 5, -10 42 (seq1, seq2, seq3...; seq1: /= 6, seq2: -= 3, seq3: += 8)
22) 2, 9, 10, 27, 18, 81, 26, 243, 34, 729, 42 2187 (odd=seq1, even=seq2; seq1: += 8, seq2: *= 3)
23) 4, 12, 16, 28, 44 72 (Next is + of previous two)
24) 2, 3, 7, 16, 32 57 (previous + ^2 of place in sequence)
25) 6, 7, 11, 20, 36 61 (previous + ^2 of place in sequence)


Quick links:

Practice: Easy | Medium | Hard | Hard + non math
Customized