185640

Appears in sequences

• a(n) = n*(n^4-1)/2.at n=11A027484
• a(n) = LCM of Fibonacci sequence {F_1,...,F_n}.at n=8A035105
• Number of labeled pure 2-complexes on n nodes (0-simplexes) with 5 2-simplexes and 8 1-simplexes.at n=12A054559
• When expressed in base 3 and then interpreted in base 4, is a multiple of the original number.at n=21A062853
• Numbers k such that phi(k) < k/5.at n=23A066765
• Integers which have more than one coprime factorization into nonprime powers which sum to the same number.at n=23A072940
• a(n) = A084190(A084190(n)).at n=15A084191
• Numbers that can be expressed as the difference of the squares of primes in exactly seventeen distinct ways.at n=0A092013
• Least number that can be expressed as the difference of the squares of primes in exactly n distinct ways.at n=16A092204
• a(n) = (prime(n)^5 - prime(n))/2.at n=5A138424
• Numbers with prime factorization p*q*r*s*t*u^3 (where p, q, r, s, t, u are distinct primes).at n=3A190378
• Let (n)_p denote the exponent of prime p in the prime power factorization of n. Then a(n) is defined by the formulas a(1)=1; for n >= 2, (a(n))_2 = (n)_2, (a(n))_3 = (n)_3 and, for p >= 5, (a(n))_p = 1 + ((2n)/(p-1))_p if p-1|2*n, and (a(n))_p = 0 otherwise.at n=23A202318
• Triangle T(n,k) of weakly graded (3+1)-free partially ordered sets (posets) on n labeled vertices with height k.at n=24A222866
• Number of ways to place 3 points on a triangular grid of side n so that they are not vertices of an equilateral triangle of any orientation.at n=13A240440
• Number of different 3 against 3 matches given n players.at n=18A271040
• Numbers n such that the multiplicative group modulo n is the direct product of 7 cyclic groups.at n=3A272597
• Positive integers that are square roots of products a*(a+d)*(a+2*d) with coprime a > 0, d >= 0.at n=23A284876
• Numbers m having greatest prime power divisor d such that d is smaller than the difference between m and the largest prime smaller than m and d is smaller than the difference between m and twice the largest prime smaller than m/2.at n=30A290290
• a(n) is the smallest k such that A316506(k) = n.at n=11A323019
• Numbers which are represented by more than one partition of the same integer.at n=36A325306