223 is a Prime Number
223 = 1 + 2 × 3 × 4 × 5 + 6 + 7 + 89
223 = 9 + 87 + 6 × 5 × 4 + 3 × 2 + 1
223 = 0^7 + 1^0 + 2^8 − 3^9 + 4^5 + 5^6 + 6^1 + 7^4 + 8^3 + 9^2
223 divides 39^3 - 1.
223 = (1 + 1) × 111 + 1
Sexy Prime (Primes p such that p + 6 is also prime)
Prime of the form k^2 + k + 41
2^223 - 1 = 18287 × 196687 × 1466449 × 2916841 × 1469495262398780123809 × 596242599987116128415063
Toothpick sequence a(n), n = 21
223 cannot be written as a sum of 3 squares. (Integers that are not a sum of three squares)
e^(π sqrt(223))≈236855705574162154847.0034 is a near-integer.
The ring of integers of the field Q(sqrt(-223)) has class number 7.
Factors: 1, 223
Two hundred twenty-three
Representations, Binary to Hexadecimal:
11011111_2
22021_3
3133_4
1343_5
1011_6
436_7
337_8
267_9
193_11
167_12
142_13
11d_14
ed_15
df_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
