Cyfers
How to Submit
Send your answers along with full name, any prior I.Q. test scores, and $5 fee via PayPal to skillitani@gmail.com. This test allows two attempts, but only the first will be marked as official.
Instructions
There is no time limit. A pocket calculator, pencil, and paper are allowed and encouraged. Reference aids will not be needed.
Find the solution that best replaces the question mark(s) in each series.
Important: Series #3 was revised on 2 October, 2024.
The Series
1) 28, 316, 432, 564, 6128, 7256, ?
2) 1, 77, ?, 99999, 5555555, 111111111, 7777777777, 333333333333
3) Z, ?, X3X3X, W4W4W4W, V5V5V5V5V, U6U6U6U6U6U
4) ?, 1023, 1203, 1230, 01230, 10230, 12030, 12300
5) 469, 1445, 6178, 8246, 10996, 21239, ?
6) 1, ?, 2, ?, 4, ?, ?, ?, ?, ?, ?, 8, ?, ?, 10274162471824
7) -234, -176, -18, 1140, 12298, ?
8) 3, 5, ?, 11, 16, 19, 24, 27
9) VVVXIX, VVIVIX, VXVXVX, IVIVIV, ?, IXIVIV
10) 2135, 3369, 45913, 571217, 691521, ?
11) 49523, 3645106, 182420500, ?
12) 72, ?, 932, 15, 317, 68, 55, ?
13) ONE, ?, Y32Y, ?, 355045
14) 18.8144, 27.14378, 36.18648, ?
15) 18, ?, 10, 14, 6, 8, 4, 5, 3, ?, 2.5
16) 1, 2, 6, ?, ?, ?, 5408554896906
17) 6969, 4698, 3484.5, 234.54, 1247.25, ?
18) ?, 34, ?, 78, 91, 45, ?, ?, -11, -32, -45, -91, -78, -56, -34, -21
19) F, 7, 9, 12, 16, 21, 27, ?, DB, 51, 61, GB, HD, 97, ?
20) ?, 3, 000000003, 4, 005, 2, ?, 8, 0009, 7
21) 7201, ?, 86, 713, 51, 239, 333, ?
22) 15893, ?, 34221, 1603, ?, 19, 8
23) 9B8D75613, ?35792468, 867?31925, 54C218G96, 276549831, 6843E1297, 7528946?3, 4912635H7
24) 84368297, 217941011161, 3861315112277, ?
25) 17, 62126, 22, 92029, 27, 94149, 32, 97079, 37, ?
26) {1, 4, 3, 3, 2, 1, 2, 5}, {4732, 68210, 517, 2309, 9312, 275, 5721, 65046}, {18928, ?, 3619, 0, 27936, ?, 40047, 390276}
27) 120153, 242495, ?, 48310178
28) 9, H, E, 10, ?, 12, A, 14, 29, ?, &, 48, Y
29) 81110914, 204312801, 21715618, 80119505, 9124412, 20730209, 3137116, ?
30) 3:421, 6:444344, 7:6544874, 2:40, 1:9, 8:55215543, 6:556555, 7:?