38 = 12 + 3 + 45 + 67 − 89
38 = 98 − 7 − 6 − 5 − 43 + 2 − 1
38 = 0^4 + 1^8 − 2^6 − 3^9 + 4^7 + 5^5 + 6^3 + 7^2 + 8^0 + 9^1
38 = 111/(1 + 1 + 1) + 1
= (2 + 2 + 2)2 + 2
= 33 + 33/3
= 44 − 4 − (4 + 4)/4
= 5 + ((5 + 5)/5)5 + 5/5
= 6 × 6 + (6 + 6)/6
= 7 × 7 − 77/7
= 8 + 8 + (88 + 88)/8
= 9 + 9 + 9 + 99/9
Number k such that k! - 1 is Prime
Number k such that (16*10^k - 31)/3 is prime.
Number of points on surface of octahedron; also coordination sequence for cubic lattice: a(0) = 1; for n > 0, a(n) = 4n^2 + 2. n=3
Number k such that k divides the sum of digits of all numbers from 1 to k.
Number of ways to partition 2n+1 into distinct positive integers, n = 8
Semiprime (Product of 2 Primes)
Factors: 1, 2, 19, 38
Thirty-eight
Representations, Binary to Hexadecimal:
100110_2
1102_3
212_4
123_5
102_6
53_7
46_8
42_9
35_11
32_12
2c_13
2a_14
28_15
26_16
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Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
