16427
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 16428
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16426
- Möbius Function
- -1
- Radical
- 16427
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 159
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1904
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Incorrect duplicate of A297408.at n=9A007355
- "BGK" (reversible, element, unlabeled) transform of 0,1,1,1,...at n=35A032060
- Primes resulting from procedure described in A048393.at n=14A048394
- a(0)=0, a(1)=1, a(n) = smallest prime >= a(n-1) + a(n-2).at n=20A055498
- a(0)=0, a(1)=1, a(n) = smallest prime > a(n-1)+a(n-2).at n=19A055499
- Primes of the form 2*k*prime(k) + 1.at n=14A062403
- Primes of the form sum 6d/(2 + mu(d)) for some k and all d dividing k.at n=31A069548
- Apart from initial 0, same as A055498.at n=20A073021
- Each term is the smallest prime > the sum of the previous 2 terms.at n=19A073022
- Primes of the form 3*m^2 - 1.at n=23A089682
- First primitive GF(2)[X] polynomial of degree n.at n=13A132447
- First primitive GF(2)[X] polynomial of degree n with at most 5 terms.at n=13A132449
- First primitive GF(2)[X] polynomials of degree n with exactly 5 terms.at n=13A132451
- First primitive GF(2)[X] polynomial of degree n and minimal number of terms.at n=13A132453
- Total number of vertices in all finite n-dimensional convex regular polytopes, or 0 if the number is infinite.at n=14A140800
- Primes congruent to 50 mod 53.at n=35A142580
- Primes congruent to 25 mod 59.at n=33A142752
- Primes congruent to 18 mod 61.at n=32A142816
- Primes of the form 12*n^2-1.at n=22A143830
- Number of collinear point-triples in the n X n X n cube.at n=6A157882