# The Roaring Nothing Number

I'm occasionally nothing,

but I roar nonetheless,

I come in two, and sometimes six,

And I am made of four.

I am found in 60, as well as 201,

but never ever am I found in 7.

• Thanks for the check mark. Out of curiosity, how close were we on the clues? – kuhl May 14 '18 at 23:08
• @kuhl Everything except "And I am made of four" – Redwolf Programs May 15 '18 at 0:07
• @kuhl That one was your first guess, sbhe vf n snpgbe bs gjragl – Redwolf Programs May 15 '18 at 0:09

Are you

20

I'm occasionally nothing, (Thanks @Riley)

0x20 is the Hex code for an ASCII Space (i.e. something) while 0x20 is 0 in mathematics (i.e. nothing).

but I roar nonetheless,

A reference to the roaring 20's

I come in two, and sometimes six,

20 is two characters. Twenty is 6 characters.

And I am made of four.

20 is evenly divisible by 4.

I am found in 60, as well as 201,

60 is evenly divisible by 20, and 20 makes up the first two numbers of 201

but never ever am I found in 7.

7 is not evenly divisible by 20, nor is 20 a part of the numeric representation of 7.

• I think "I'm occasionally nothing" may refer to the fact that 0x20 is a space in ascii. – Riley May 14 '18 at 20:51
• @Riley nice catch. Yeah, that makes sense. Thanks! – kuhl May 14 '18 at 20:57
• Wait, you misinterpreted what I said. The space is the nothing. And 0x20 is hex for 32, not 0. Oh I see you interpreted that as multiplication. But I think the space as nothing is what was intended. – Riley May 14 '18 at 20:58
• 0x00 is 0 in mathematics... – Ian MacDonald May 14 '18 at 21:00
• @IanMacDonald 0xanything is 0 in math. – kuhl May 14 '18 at 21:08

My best guess is

O / 0 / "Zero"

I'm occasionally nothing,

Used to denote the value 0

but I roar nonetheless,

The letter 'O' still makes a sound, as in the word "roar"

I come in two, and sometimes six,

"O" is in TWO, and is the bottom half of the digit version of 6

And I am made of four.

"ZERO" is four letters.

I am found in 60, as well as 201,

60 and 201 contain 0 as a digit.

but never ever am I found in 7.

Neither 7 nor SEVEN contain an O shape.

• Hmm, wrong number. But a good guess! – Redwolf Programs May 14 '18 at 19:14
• This was my best guess too, but I'd have been disappointed if it was the right answer. (+1 though.) – Rand al'Thor May 14 '18 at 19:43
• Ha, same. I threw it up here just in case – Matt May 14 '18 at 19:44

You are number

3

I'm occasionally nothing,

rotated by 180°, you get ε - used to denote infinitesimal numbers (e.g. in nonstandard analysis) or a very small number (in classical calculus)

but I roar nonetheless,

one, two, three, (go) is used sometimes to count before some loud action (such as music or a car race start)

I come in two, and sometimes six,

the glyph consists of two arcs, a prime factor of 6

And I am made of four.

drawn in four lines in 7-segment display style

I am found in 60, as well as 201,

a prime factor of both of these numbers

but never ever am I found in 7.

but not a prime factor of 7

• This answer uses 5 of the seven segments in a seven-segment display... – Chowzen May 14 '18 at 21:14
• @Chowzen 5 segments, but just 4 lines - thus "style" – Radovan Garabík May 14 '18 at 21:21