3107
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3360
- Proper Divisor Sum (Aliquot Sum)
- 253
- 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
- 2856
- Möbius Function
- 1
- Radical
- 3107
- 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
- 123
- 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
- Semigroups of order n with 1 idempotent, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).at n=5A002786
- Expansion of (1-x+x^2)/((1-x)^2*(1-x^2)*(1-x^4)).at n=50A005232
- Coordination sequence T2 for Zeolite Code ZON.at n=39A009920
- Number of partitions of n into parts 4k+2 and 4k+3 with at least one part of each type.at n=56A035626
- Number of partitions satisfying cn(1,5) + cn(4,5) <= cn(2,5) and cn(1,5) + cn(4,5) <= cn(3,5).at n=37A039876
- The sequence e, given that c is a left shift by one place of b.at n=55A041003
- Numbers k such that the string 3,2 occurs in the base 9 representation of k but not of k-1.at n=42A044280
- Numbers k such that the string 0,7 occurs in the base 10 representation of k but not of k-1.at n=33A044339
- Numbers n such that string 0,7 occurs in the base 10 representation of n but not of n+1.at n=33A044720
- Numbers whose base-4 representation contains exactly three 0's and two 3's.at n=30A045078
- Discriminants of imaginary quadratic fields with class number 18 (negated).at n=23A046015
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 22.at n=34A051987
- Numbers k such that A053230(k) = 3.at n=42A053235
- Triangle read by rows: semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).at n=15A058123
- Number of primes <= 13^n.at n=4A058191
- Number of 6-block tricoverings of an n-set.at n=2A060484
- Triangle T(n,k) of k-block tricoverings of an n-set (n >= 3, k >= 4).at n=10A060487
- Composite and every divisor (except 1) contains the digit 3.at n=32A062668
- Write 0, 1, 2, 3, 4, ... in a triangular spiral, then a(n) is the sequence found by reading the terms along the line from 0 in the direction 0, 7, ...at n=26A062725
- Semiprimes p1*p2 such that p2 > p1 and p2 mod p1 = 5.at n=28A064903