77 = 12 + 3 × 4 + 5 + 6 × 7 + 8 + 9
77 = 9 + 8 + 7 × 6 + 5 + 4 + 32 × 1
77 = 0^6 + 1^9 − 2^8 − 3^7 + 4^5 + 5^3 + 6^4 + 7^0 + 8^2 + 9^1
77 = 11 × ((1 + 1) × (1 + 1 + 1) + 1)
= 2 × 2 × 22 − 22/2
= 3 × 33 − 3 − 3/3
= (4 − 4/4)4 − 4
= 55 + (55 + 55)/5
= 66 + 66/6
= 77
= 88 − 88/8
= 9 × 9 − (9 + 9 + 9 + 9)/9
Number of Partitions of 12
Sum of the first n primes
Smallest number of multiplicative persistence 4
Number k such that (k! + 3)/3 is prime
Integer k such that 10^k+21 is prime.
Palindrome k such that 3k + 1 is also a palindrome
Semiprime (Product of 2 Primes)
Factors: 1, 7, 11, 77
Seventy-seven
Representations, Binary to Hexadecimal:
1001101_2
2212_3
1031_4
302_5
205_6
140_7
115_8
85_9
70_11
65_12
5c_13
57_14
52_15
4d_16
<--- --->
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
