238 = 1 + 2 × 3 + 4 + 5 × 6 × 7 + 8 + 9
238 = 9 + 8 + 7 × 6 × 5 + 4 + 3 × 2 + 1
238 = 0^2 + 1^3 − 2^9 + 3^7 − 4^8 + 5^4 + 6^6 + 7^5 + 8^0 + 9^1
238 divides 69^2 - 1.
238 = (1 + 1) × (11(1+1) − 1 − 1)
238 = 2 × ((22/2)2 − 2)
a(n) = n*(n+3), n = 14
Numbers k such that k^4 + 1 is prime.
Numbers k such that 7^k - 2 is a prime.
Sum of the first n primes.
Sphenic number: Product of 3 distinct Primes, (List)
Factors: 1, 2, 7, 14, 17, 34, 119, 238
Two hundred thirty-eight
Representations, Binary to Hexadecimal:
11101110_2
22211_3
3232_4
1423_5
1034_6
460_7
356_8
284_9
1a7_11
17a_12
154_13
130_14
10d_15
ee_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
