72930

Appears in sequences

• a(n) = 3*binomial(2n-1,n).at n=8A003409
• Central elements of the (1,2)-Pascal triangle A029635.at n=9A029651
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 18.at n=30A031696
• Distinct even numbers in writing first numerator and then denominator of each element to the right of the central elements of the 1/3-Pascal triangle (by row).at n=40A046562
• Expansion of 1/(1-2*x-3*x^2+2*x^3).at n=11A046672
• a(0) = 1; for n > 0, a(n) = binomial(n, floor(n/2)) + binomial(n-1, floor(n/2)).at n=18A050168
• 1/256 of tenth unsigned column of triangle A053120 (T-Chebyshev, rising powers, zeros omitted).at n=9A054333
• Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,57.at n=17A065697
• Products of exactly 6 distinct primes.at n=10A067885
• a(n) is the smallest positive integer m for which A070194(m) (i.e., the maximal gap in {k|gcd(k,m) = 1, 1 <= k <= m-1}) is n.at n=17A070971
• Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n has exactly 6 distinct prime factors and n is squarefree.at n=0A071145
• Smallest squarefree number k with exactly n prime factors such that the sum of the prime factors is divisible by the largest prime dividing k, or 0 if no such k exists.at n=6A071147
• Integers which have more than one coprime factorization into nonprime powers which sum to the same number.at n=4A072940
• Numbers with six distinct prime divisors.at n=11A074969
• a(n) = A076926(n)/n.at n=6A076927
• Triangle read by rows: T(n,k) = A002110(n)/prime(n+1-k), k = 1..n.at n=24A077011
• a(n) = Sum_{k=1..prime(n)-1} floor(k^3/prime(n)).at n=18A078837
• Smallest number with n prime divisors such that the sum of the prime divisors is also a divisor, or 0 if no such number exists.at n=5A086487
• a(n) is the least k with n distinct prime factors such that the sum of its prime factors (counting multiplicity) divides k, or 0 if no such k exists. First member of A036844 with n distinct prime factors.at n=5A104466
• Triangle T(n,k) read by rows: T(n,0) = A002110(n) and T(n,k) = A002110(n)/prime(k) for 1<=k<=n.at n=32A121281