Cyfers

How to Submit

Send your answers along with your full name, identity verification (photo I.D. or passport), any prior I.Q. test scores, and 10 USD via PayPal or AliPay to skillitani@gmail.com. Retests are not permitted. Available test statistics can be viewed here.

The scoring fee is waived for members of the Moonlite and Moonlight societies.

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: Items 27 & 28 were revised on 1 January 2025.

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, 2435109, ?, 489132021

28) A, 22, ?, DD, 5, ?, 7, HH, I, JJ, ?, LL, 13, NN, ?, PP, 17, RR, 19, TT, U, VV, 23, XX, Y, ZZ

29) 81110914, 204312801, 21715618, 80119505, 9124412, 20730209, 3137116, ?

30) 3:421, 6:444344, 7:6544874, 2:40, 1:9, 8:55215543, 6:556555, 7:?