7154
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 12654
- Proper Divisor Sum (Aliquot Sum)
- 5500
- 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
- 3024
- Möbius Function
- 0
- Radical
- 1022
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 75
- Smith Number
- no
- Vampire 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
- yes
- Odd
- no
Appears in sequences
- Number of primitive n-bead necklaces (turning over is allowed) where complements are equivalent.at n=19A000046
- MacMahon's generalized sum of divisors function.at n=36A002127
- Number of isonemal fabrics of period exactly n.at n=17A005441
- Numbers k such that 8*3^k - 1 is prime.at n=15A005541
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AET = AlPO4-8 [Al36P36O144] starting with a T5 atom.at n=5A018951
- a(n) is the smallest k > a(n-1) such that k^2 has no digit in common with a(n-1)^2.at n=41A030287
- Numbers whose set of base-13 digits is {3,4}.at n=17A032837
- Every run of digits of n in base 13 has length 2.at n=39A033011
- Numerators of continued fraction convergents to sqrt(268).at n=7A041502
- CIK transform of Pascal's triangle A007318.at n=49A055376
- CIK transform of Pascal's triangle A007318.at n=50A055376
- Number of bracelet structures using exactly two different colored beads.at n=18A056357
- Number of primitive (period n) bracelet structures using exactly two different colored beads.at n=18A056366
- If D[n] is divisor-set of n, then in set of 1+D only 2 primes occur:{2,3}; also n is not squarefree.at n=22A072607
- n is divisible by the sum of all divisors of n which are less than the square root of n (values of n where 1 is the only divisor less than sqrt(n) are excluded as trivial cases.).at n=35A088345
- Beginning with 1, minimum value such that gcd(a(2n-1),a(2n)) = 1, gcd(a(2n),a(2n+1))>1 and a(n) > a(n-1).at n=46A091856
- Least k such that (k*Mersenne-prime(n))^2 + 1 is prime.at n=17A098774
- a(n) = (p^2 - 1) / 12, where p is the n-th prime of the form 4*k+1.at n=28A109255
- One seventh of the sum of the first n primes, when an integer.at n=19A112272
- Row sums of correlation triangle for floor((n+3)/3).at n=37A115266