1356
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 3192
- Proper Divisor Sum (Aliquot Sum)
- 1836
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 448
- Möbius Function
- 0
- Radical
- 678
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 52
- 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
- Expansion of 1/theta_4(q)^2 in powers of q.at n=8A001934
- Numbers k such that (k^2 + k + 1)/19 is prime.at n=37A002643
- Expansion of 1/theta_3(q)^2 in powers of q.at n=8A004403
- Positive even numbers that are not the sum of a pair of twin primes.at n=27A007534
- Coordination sequence T2 for Zeolite Code AST.at n=26A008037
- Coordination sequence T2 for Zeolite Code EDI.at n=26A008085
- Coordination sequence T3 for Zeolite Code THO.at n=26A008240
- Coordination sequence T3 for Zeolite Code RSN.at n=24A009887
- Aliquot sequence starting at 660.at n=1A014362
- Powers of cube root of 22 rounded down.at n=7A018039
- Powers of cube root of 22 rounded to nearest integer.at n=7A018040
- Number of lines through exactly 9 points of an n X n grid of points.at n=48A018816
- Squares on infinite chessboard at n moves from center using a {2,3} fairy knight.at n=21A018839
- 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 T3 atom.at n=4A018949
- Numbers k such that the continued fraction for sqrt(k) has period 20.at n=27A020359
- a(n) = Sum_{k>=1} floor(tau^(n-k)) where tau is A001622.at n=13A020956
- Fibonacci sequence beginning 2, 14.at n=11A022369
- Number of partitions of n into prime power parts (1 included); number of nonisomorphic Abelian subgroups of symmetric group S_n.at n=26A023893
- a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence).at n=17A024685
- a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = A000201 (lower Wythoff sequence).at n=16A025118