775
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 992
- Proper Divisor Sum (Aliquot Sum)
- 217
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 600
- Möbius Function
- 0
- Radical
- 155
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 152
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- siebenhundertfünfundsiebzig· ordinal: siebenhundertfünfundsiebzigste
- English
- seven hundred seventy-five· ordinal: seven hundred seventy-fifth
- Spanish
- setecientos setenta y cinco· ordinal: 775º
- French
- sept cent soixante-quinze· ordinal: sept cent soixante-quinzième
- Italian
- settecentosettantacinque· ordinal: 775º
- Latin
- septingenti septuaginta quinque· ordinal: 775.
- Portuguese
- setecentos e setenta e cinco· ordinal: 775º
Appears in sequences
- Number of partitions of n, with three kinds of 1,2,3 and 4 and two kinds of 5,6,7,...at n=8A000711
- Number of partitions of n into relatively prime parts. Also aperiodic partitions.at n=21A000837
- Fermat coefficients.at n=7A000970
- a(n) = (8*n+1)*(8*n+7).at n=3A001533
- Hit polynomials.at n=6A001884
- Number of bipartite partitions.at n=8A002768
- Number of rooted trees with n vertices in which vertices at the same level have the same degree.at n=37A003238
- Numbers that are the sum of 12 positive 5th powers.at n=36A003357
- Sum of 10 nonzero 8th powers.at n=3A003388
- Divisors of 2^20 - 1.at n=21A003529
- Divisors of 2^40 - 1.at n=30A003546
- Numbers that are the sum of at most 10 nonzero 8th powers.at n=37A004883
- Numbers that are the sum of at most 11 nonzero 8th powers.at n=40A004884
- Numbers that are the sum of at most 12 nonzero 8th powers.at n=43A004885
- a(n)=least number m such that m-a(n-1)<>a(j)-a(k) for all j,k less than m; a(1)=1, a(2)=3.at n=27A004979
- Mian-Chowla sequence (a B_2 sequence): a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that the pairwise sums of elements are all distinct.at n=23A005282
- a(n) = a(n-1) + a(n-9) for n >= 9; a(n) = 1 for n=0..7; a(8) = 2.at n=38A005711
- Number of fractions in Farey series of order n.at n=50A005728
- Successive states of the Rule 110 cellular automaton defined by 000, 001, 010, 011, ..., 111 -> 0,1,1,1,0,1,1,0 when started with a single ON cell.at n=9A006978
- Difference between A000294 and the number of solid partitions of n (A000293).at n=14A007326