7550
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 14136
- Proper Divisor Sum (Aliquot Sum)
- 6586
- 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
- 3000
- Möbius Function
- 0
- Radical
- 1510
- 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
- 88
- 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
- Numerators of continued fraction convergents to sqrt(116).at n=8A041210
- Numbers whose base-5 representation contains exactly three 0's and three 2's.at n=8A045187
- Twice second pentagonal numbers.at n=50A049451
- Numbers n such that n | 5^n + 4^n + 3^n.at n=21A057236
- a(n) = T(n^3) - T(n^2), where T() are the triangular numbers (A000217).at n=5A085743
- Expansion of g.f. (1-x+x^2)/(1+x-x^3).at n=59A104771
- a(1) = 393; for n > 1, a(n) = a(n-1) + 1 + sum of distinct prime factors of a(n-1) that are < a(n-1). edit.at n=43A105210
- Numbers n such that A117731(n) differs from A082687(n).at n=42A125740
- Triangle T, read by rows, where the g.f. of row n of T^n = (n^2 + y)^n for 0 <= n <= 29, where T^n denotes the n-th power of T considered as (lower-left) matrix.at n=17A132870
- Column 2 of triangle A132870 (first 30 terms only).at n=3A132874
- Numbers k such that k and k^2 use only the digits 0, 1, 2, 5 and 7.at n=39A136824
- Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 7.at n=16A136889
- Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 7.at n=34A136899
- Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 7.at n=50A136912
- Numbers k such that k and k^2 use only the digits 0, 2, 5 and 7.at n=9A136915
- Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 8.at n=13A136916
- Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 9.at n=25A136917
- Second entry in row n of triangle in A169940.at n=25A169943
- Numbers n such that 4n+3 is a palindromic prime.at n=23A193419
- Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having three distinct values for every i<=n and j<=n.at n=8A211498