30783

Appears in sequences

• a(n) = n^3 + n^2 + n.at n=31A027444
• In A015922, not in A033553.at n=37A033554
• a(n) = Sum_{i=0..n} A047080(i,n-i).at n=25A047084
• Expansion of 1/(1+2*x^2+x^3).at n=27A077967
• Expansion of e.g.f. 1/(1 - 3*sinh(x)).at n=5A107403
• Number of asymmetric mobiles (cycle rooted trees) with n generators.at n=10A108529
• Integers i such that 9*i = 25 X i, but 17*i is not 49 X i.at n=32A115811
• Number of nonisomorphic n-element self-dual posets (or partially ordered sets).at n=10A133983
• a(n) = prime(n)^3 + prime(n)^2 + prime(n).at n=10A181149
• Number of compositions of n into distinct parts with exactly eight descents.at n=19A241727
• Products of three distinct primes p1, p2 and p3 (sphenic numbers) with p1<p2 and p3 is the concatenation of p1 with p2.at n=9A281592
• Odd numbers m such that sigma(x) = m has more than 1 solution.at n=14A300869
• Number of unlabeled hyperforests spanning n vertices with singleton edges allowed.at n=8A304977
• Numbers k such that 305*2^k+1 is prime.at n=24A322922
• Starts of runs of 4 consecutive Gray-code Niven numbers (A344341).at n=31A344344
• a(n) is the smallest integer k > 2*n such that Product_{i=1..n} (k - i) has no prime factor p in n < p < 2*n.at n=31A386620