298
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 450
- Proper Divisor Sum (Aliquot Sum)
- 152
- 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
- 148
- Möbius Function
- 1
- Radical
- 298
- 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
- 24
- Smith 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
Names
- German
- zweihundertachtundneunzig· ordinal: zweihundertachtundneunzigste
- English
- two hundred ninety-eight· ordinal: two hundred ninety-eighth
- Spanish
- doscientos noventa y ocho· ordinal: 298º
- French
- deux cent quatre-vingt-dix-huit· ordinal: deux cent quatre-vingt-dix-huitième
- Italian
- duecentonovantotto· ordinal: 298º
- Latin
- ducenti nonaginta octo· ordinal: 298.
- Portuguese
- duzentos e noventa e oito· ordinal: 298º
Appears in sequences
- Number of even sequences with period 2n.at n=7A000208
- Number of twin prime pairs < square of n-th prime.at n=31A000885
- 2 together with primes multiplied by 2.at n=35A001747
- Numbers k for which the rank of the elliptic curve y^2 = x^3 - k is 2.at n=40A002154
- Numbers k such that binomial(2*k,k) is divisible by (k+1)^2.at n=25A002503
- Numbers k such that (k^2 + k + 1)/21 is prime.at n=15A002644
- Numbers m such that 6m-1, 6m+1 are twin primes.at n=54A002822
- a(n) (n>6) is least integer > a(n-1) with precisely three representations a(n) = a(i) + a(j), 1 <= i < j < n, a(n) = n for n=1..6.at n=58A003045
- Problimes (second definition).at n=53A003067
- Positions of letter c in the tribonacci word abacabaabacababac... generated by a->ab, b->ac, c->a (cf. A092782).at n=47A003146
- Squarefree integers m such that the fundamental unit of Q(sqrt(m)) has norm -1. Also, squarefree integers m such that the Pell equation x^2 - m*y^2 = -1 is soluble.at n=49A003654
- Numbers k such that the continued fraction for sqrt(k) has odd period length.at n=52A003814
- Inverse Möbius transform of A003964.at n=52A003979
- a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n^2 + 5)/6.at n=12A004006
- Divisible only by primes congruent to 2 mod 7.at n=25A004620
- Sum of squares of primes dividing n.at n=50A005063
- Sum of squares of odd primes dividing n.at n=50A005066
- Numbers k such that k and k+1 have the same number of divisors.at n=44A005237
- Nontotients: even numbers k such that phi(m) = k has no solution.at n=48A005277
- Noncototients: numbers k such that x - phi(x) = k has no solution.at n=29A005278