15094
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 22644
- Proper Divisor Sum (Aliquot Sum)
- 7550
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7546
- Möbius Function
- 1
- Radical
- 15094
- 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
- 115
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence for sigma-CrFe, Position Xd.at n=31A009959
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 98 ones.at n=7A031866
- Maximal number of regions into which 4-space can be divided by n hyperspheres.at n=22A059173
- Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of a.at n=25A096031
- Least n-digit number whose square is exclusionary, or 0 if no such number exists.at n=4A112321
- Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326).at n=23A115708
- a(n) = 2*a(n-1) - a(n-2) + n + 1.at n=43A121968
- a(n) = 8*n^2 + 7*n + 1.at n=43A194268
- Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=6A252186
- Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=1A252191
- T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=29A252192
- T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=34A252192
- Numbers k such that 4*R_k + 7*10^k + 3 is prime, where R_k = 11...11 is the repunit (A002275) of length k.at n=8A259136
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 521", based on the 5-celled von Neumann neighborhood.at n=25A272736
- Sum over all partitions of n of the number of distinct parts i of multiplicity i+1.at n=42A276434
- Numbers m > 3 such that m-1, m, m+1 belong to A307002.at n=46A340748
- Composite numbers k such that k-A238525(k) and k+A238525(k) are prime.at n=36A342648
- Numbers that are the sum of nine fourth powers in ten or more ways.at n=20A345594
- Numbers that are the sum of nine fourth powers in exactly ten ways.at n=18A345852
- Consecutive states of the linear congruential pseudo-random number generator for Smalltalk-80 when started at 1.at n=17A384220