161700

Appears in sequences

• Binomial coefficients C(n,97).at n=3A017761
• Binomial coefficients C(100,n).at n=3A017816
• Numbers k such that n | sigma_10(k) + phi(k)^10.at n=24A055704
• Generalized Stirling numbers.at n=4A061689
• Triangle of generalized Stirling numbers.at n=24A061691
• Triangle of generalized Stirling numbers.at n=25A061691
• Expansion of (1-x)^(-1)/(1-2*x+x^2+2*x^3).at n=23A077857
• a(n) = Product_{k=1..n} P(k), where P(k) is the smallest prime >= k.at n=7A118456
• Tetrahedral numbers n*(n+1)*(n+2)/6 with n, n+1 and n+2 nonprime.at n=33A152622
• Triangle T(n, k) = binomial(n, k)*binomial(n+1, k+1)*binomial(2*n, 2*k)/(n-k+1), read by rows.at n=24A155497
• Number of ways to choose three points in an (n X n)-grid (or geoplane).at n=9A178208
• Numbers with prime factorization pqr^2s^2t^2.at n=10A190379
• Quarter-square tetrahedrals: a(n) = k*(k - 1)*(k - 2)/6, k = A002620(n).at n=20A217482
• a(n) = binomial(3*n + 1,3).at n=32A228887
• a(n) = (p+1)*(p+2)*(p+3)/6 where p is the n-th prime.at n=24A271512
• a(n) = (5*n + 3)*(5*n + 4)*(5*n + 5)/6.at n=19A300522
• Exponential weird numbers: numbers that are exponential abundant (A129575) but not exponential pseudoperfect (A318100).at n=9A321146
• Least k whose set of divisors contains exactly n quadruples (x, y, z, w) such that x^3 + y^3 + z^3 = w^3, or 0 if no such k exists.at n=12A337098
• Coreful weird numbers: numbers k that are coreful abundant (A308053) but no subset of their aliquot coreful divisors sums to k.at n=9A339939
• a(n) is the number of free polyominoes with k cells and n-k distinguished vertices.at n=10A343417