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Three closely related number sequences go:

  • $63, 37, 22, 39, 92, 26, 8, ?$
  • $13, 11, 66, 9, 31, 1, 36, ?$
  • $30, 54, 6, 23, 4, 7, ?$

All these sequences are really elementary.

What number comes next in each sequence? And what is missing?

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I think the next number in the three sequences, and what is missing are:

15, 3 and 12 and missing are corresponding numbers for Q, W and J

The sequences are numbers which represent the

Atomic numbers of the chemical elements which have the same first letter as the three rows of a Qwerty keyboard and are the first appearance of these letters in the ordered list of elements.


63 = Europium, 37 = Rubidium, 22 = Titanium, 39 = Yttrium, 92 = Uranium, 26 = Iron, 8 = Oxygen, ? = 15 = Phosphorus

13 = Aluminum, 11 = Sodium, 66 = Dysprosium, 9 = Fluorine, 31 = Gallium, 1 = Hydrogen, 36 = Krypton, ? = 3 = Lithium

30 = Zinc, 54 = Xenon, 6 = Carbon, 23 = Vanadium, 4 = Beryllium, 7 = Nitrogen, ? = 12 = Magnesium

There are no chemical elements initially Q, W and J so these are missing.

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