121 = 1 × 2 + 3 × 4 + 5 + 6 + 7 + 89
121 = 9 + 8 + 7 × 6 + 5 × 4 × 3 + 2 × 1
121 = 0^5 − 1^8 + 2^9 + 3^4 − 4^7 + 5^6 + 6^3 + 7^1 + 8^2 + 9^0
121 = 11^2
121 divides 3^5 - 1.
121 = 11(1+1)
121 = (22/2)2
121 = (33/3)(3−3/3)
121 = (44/4)((4+4)/4)
121 = 5 + 5 + 555/5
121 = 66 × 66/(6 × 6)
121 = ((7 + 7)/7)7 − 7
121 = 88 × 88/(8 × 8)
121 = 9 + (999 + 9)/9
121 = 1 + 3 + 9 + 27 + 81 = 30 + 31 + 32 + 33 + 34
121 = Sum of divisors of square number 9^2
Number n such that (n^97+1)/(n+1) is prime.
Number of fractions in Farey series of order 19 : 0/1, 1/19, 1/18, 1/17, 1/16, 1/15, 1/14, 1/13, 1/12, 1/11, 1/10, 2/19, 1/9, 2/17, 1/8, 2/15, 1/7, 2/13, 3/19, 1/6, 3/17, 2/11, 3/16, 1/5, 4/19, 3/14, 2/9, 3/13, 4/17, 1/4, 5/19, 4/15, 3/11, 5/18, 2/7, 5/17, 3/10, 4/13, 5/16, 6/19, 1/3, 6/17, 5/14, 4/11, 7/19, 3/8, 5/13, 7/18, 2/5, 7/17, 5/12, 8/19, 3/7, 7/16, 4/9, 5/11, 6/13, 7/15, 8/17, 9/19, 1/2, 10/19, 9/17, 8/15, 7/13, 6/11, 5/9, 9/16, 4/7, 11/19, 7/12, 10/17, 3/5, 11/18, 8/13, 5/8, 12/19, 7/11, 9/14, 11/17, 2/3, 13/19, 11/16, 9/13, 7/10, 12/17, 5/7, 13/18, 8/11, 11/15, 14/19, 3/4, 13/17, 10/13, 7/9, 11/14, 15/19, 4/5, 13/16, 9/11, 14/17, 5/6, 16/19, 11/13, 6/7, 13/15, 7/8, 15/17, 8/9, 17/19, 9/10, 10/11, 11/12, 12/13, 13/14, 14/15, 15/16, 16/17, 17/18, 18/19, 1/1
Centered 12-gonal number, or centered dodecagonal number: number of the form 6*k*(k-1) + 1.
Semiprime (Product of 2 Primes)
Factors: 1, 11, 121
One hundred twenty-one
Representations, Binary to Hexadecimal:
1111001_2
11111_3
1321_4
441_5
321_6
232_7
171_8
144_9
100_11
a1_12
94_13
89_14
81_15
79_16
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