In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles.

If a number conforms to a special rule, I call it a Voluminous Number™.
Use the examples below to find the rule.

Voluminous Numbers™ Not Voluminous Numbers™
62 22
18 35
42 97
25 70
76 45
31 17

And, if you want to analyze, here is a CSV version:

Voluminous Numbers™,Not Voluminous Numbers™

The puzzle satisfies the series' inbuilt assumption, that each number can be tested for whether it is a Voluminous Number™ without relying on the other numbers.

What is the special rule these numbers conform to?

  • 1
    $\begingroup$ nice. but rot13(vfa'g n 1 abeznyyl evtug whfgvsvrq ba n qvtvgny 7 frtzrag sbag)? $\endgroup$
    – SteveV
    Sep 9, 2018 at 0:46
  • $\begingroup$ @SteveV rot13(Nynf, lbh ner evtug! V nffhzrq yrsg nyvtazrag, jubbcf!) $\endgroup$ Sep 9, 2018 at 0:50

1 Answer 1


A Voluminous Number™️ is

a number so that when it’s digits are written digitally and laid over each other, they cover all possible placements for a digital number (like an 8). Assume a 1 is left aligned for 31 to work.

Picture for reference:


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