In Mathematics
- 181 is an odd number
- 181 is a centered number
- 181 is a centered pentagonal number
- 181 is a centered 12-gonal number
- 181 is a centered 18-gonal number
- 181 is a centered 30-gonal number
- 181 is a centered square number
- 181 is a star number that represents a centered hexagram (as in the game of Chinese checkers)
- 181 is a deficient number, as 1 is less than 181
- 181 is an odious number
- 181 is a prime number
- 181 is a Chen prime
- 181 is a dihedral prime
- 181 is a full reptend prime
- 181 is a palindromic prime
- 181 is a strobogrammatic prime, the same when viewed upside down
- 181 is a twin prime with 179
- 181 is a square-free number
- 181 is an undulating number, if written in the ternary, the negaternary, or the nonary numeral systems
- 181 is the difference of 2 square numbers: 912 – 902
- 181 is the sum of 2 consecutive square numbers: 92 + 102
- 181 is the sum of 5 consecutive prime numbers: 29 + 31 + 37 + 41 + 43
Read more about this topic: 181 (number)
Famous quotes containing the word mathematics:
“Mathematics alone make us feel the limits of our intelligence. For we can always suppose in the case of an experiment that it is inexplicable because we don’t happen to have all the data. In mathematics we have all the data ... and yet we don’t understand. We always come back to the contemplation of our human wretchedness. What force is in relation to our will, the impenetrable opacity of mathematics is in relation to our intelligence.”
—Simone Weil (1909–1943)
“I must study politics and war that my sons may have liberty to study mathematics and philosophy.”
—John Adams (1735–1826)