Let's count to infinity!

[bmonk]

The percent chance of getting at least one head when throwing two ideal coins.

[Mgbu]

2² × 19
LXXVI
1001100
4C

(all the same)

[bmonk]

The least common multiple of the fourth and fifth primes.

[SpikedMath]

[Zapp]

the smallest natural number, which cannot be expressed as the sum of less than 19 bisquares(x^4)

[bmonk]

'π (Greek numerals)

[SpikedMath]

[Zapp]

2*41 is the only natural product which expresses this number

[bmonk]

The 23rd prime, which is also the sum of three consecutive primes starting with 23, or five consecutive primes ending in 23.

[SpikedMath]

The number of penteract 5-faces in the seven-dimensional hypercube above.

Spoiler! :

84

[bmonk]

Nice one!

The product of the 2nd and 3rd Fermat Primes

[bmonk]

I can't resist wondering why nobody has counted LXXXVI.

[Gary]

Since the rules prohibit one person posting two successive numbers we need to repeat that value:

Spoiler! :

= 86, if I didn't mess up

[SpikedMath]

Two 86's in a row

I'll do a simple binary: 1010111

Or, according to Wikipedia: It's the number of (league-high) goals scored by Wayne Gretzky in the 1983–84 NHL season.

[bmonk]

Two 86's in a row

I'll do a simple binary: 1010111

Or, according to Wikipedia: It's the number of (league-high) goals scored by Wayne Gretzky in the 1983–84 NHL season.

Yeah, I couldn't actually post the 86, so I just wondered why nobody had.

The number of keys on a piano.

[Gary]

Verse 12 of 100 bottles of beer.

[bmonk]

'Ϙ (Greek Koppa), or (in Latin), XC.

[SpikedMath]

Number corresponding to the xkcd comic titled "Pwned".

[Gary]

Spiked Math entry "How To Email Your Prof".

[SpikedMath]

The number of solutions to Znám's problem for length 8.