1315
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1584
- Proper Divisor Sum (Aliquot Sum)
- 269
- 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
- 1048
- Möbius Function
- 1
- Radical
- 1315
- Omega Function (Ω)
- 2
- 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
- 52
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- 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
Appears in sequences
- a(n) = floor(n*phi^8), where phi is the golden ratio, A001622.at n=28A004923
- a(n) = round(n*phi^8), where phi is the golden ratio, A001622.at n=28A004943
- Coordination sequence T1 for Zeolite Code DAC.at n=23A008067
- Expansion of (1+x^5)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=43A008766
- Number of ordered triples of integers from [ 1,n ] with no common factors between pairs.at n=29A015632
- Expansion of 1/(1 - x^4 - x^5 - x^6 - x^7).at n=34A017829
- Powers of fifth root of 13 rounded down.at n=14A018150
- Powers of fifth root of 13 rounded to nearest integer.at n=14A018151
- a(n) = a(n-1) + c(n) for n >= 3, a( ) increasing, given a(1)=1 a(2)=2; where c( ) is complement of a( ).at n=45A022946
- Numbers k such that Fibonacci(k) == -5 (mod k).at n=39A023165
- Index of 7^n within the sequence of the numbers of the form 7^i*8^j.at n=52A025725
- Index of 10^n within the sequence of the numbers of the form 5^i*10^j.at n=42A025743
- (d(n)-r(n))/5, where d = A006527 and r is the periodic sequence with fundamental period (4,1,4,0,1).at n=25A026036
- a(n) is the n-th diagonal sum of left justified array T given by A027960.at n=21A027975
- Number of connected functions on n points with a loop of length 5.at n=7A029868
- Cube root of A030673.at n=48A030674
- Positions of records in A030757.at n=33A030762
- Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 7.at n=20A031410
- Numbers k such that 239*2^k+1 is prime.at n=16A032496
- Concatenation of n-th prime number and n-th lucky number.at n=5A032603