12250
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 26676
- Proper Divisor Sum (Aliquot Sum)
- 14426
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4200
- Möbius Function
- 0
- Radical
- 70
- Omega Function (Ω)
- 6
- 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
- no
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 63
- 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
- a(n) = [ a(n-1)/a(1) ] + [ a(n-1)/a(2) ] + ... + [ a(n-1)/a(n-1) ] for n >= 3, with initial terms 2,2.at n=14A022868
- a(n) = (d(n)-r(n))/2, where d = A026054 and r is the periodic sequence with fundamental period (1,0,0,0).at n=47A026055
- Numbers k such that 75*2^k+1 is prime.at n=37A032387
- Numbers that, when expressed in base 5 and then interpreted in base 10, yield a multiple of the original number.at n=47A032543
- a(n) = 10*n^2.at n=35A033583
- Sum of the lengths of the cycle types of the permutation created by duality and reversal on the partitions of n.at n=33A036050
- Numbers that are divisible by 10 and are differences between two cubes in at least one way.at n=17A038854
- Triangle of coefficients of certain polynomials (exponents in decreasing order).at n=32A046757
- Numbers n such that n | 7^n + 6^n + 5^n + 4^n + 3^n + 2^n + 1^n.at n=40A056750
- Numbers k such that 2^k - 15 is prime.at n=26A059612
- If n mod 2 = 0 then a(n) = n^4/4 - 2*n^2 + 3*n; otherwise, a(n) = n^4/4 - 2*n^2 + 3*n - 5/4.at n=15A064835
- Numbers n such that the digital binary sum of n equals core(n), the squarefree part of n.at n=37A077476
- a(n) = n^3 + prime(n).at n=22A089620
- Triangle read by rows, defined by T(n,k) = C(n,k)*S2(n,k), 0 <= k <= n, where C(n,k) are the binomial coefficients and S2(n,k) are the Stirling numbers of the second kind.at n=32A090683
- a(n) = 6*2^n - 3*n - 5.at n=11A101946
- Denominator of the continued fraction convergents of the decimal concatenation of the powers of 2.at n=5A128875
- Numbers such that the digital sum base 2 and the digital sum base 3 and the digital sum base 10 all are equal.at n=14A135120
- Numbers such that the digital sum base 2 and the digital sum base 5 and the digital sum base 10 all are equal.at n=11A135125
- Numbers such that the digital sums in bases 2, 3, 5 and 7 all are equal.at n=15A135127
- Numbers such that the digital sums in bases 2, 3, 5 and 10 all are equal.at n=1A135128