60650

Appears in sequences

• a(0) = 1, a(n) = 42*n^2 + 2 for n>0.at n=38A010023
• Generalized Pascal's triangle made using Mod[(Prime[n] - 1)/2, 4] == 2 primorial-like Stirling polynomials.at n=61A119724
• a(n) = Sum_{k=1..n} k*lcm(k,k')/gcd(k,k'), where k' is arithmetic derivative of k.at n=29A190122
• Auxiliary r(n) sequence used to prove some properties about Rowland's sequence: r(1) = 1, and r(n) = 1/2*(c(n)+1), where c(n) is A190894, for n>1.at n=42A190895
• Number of non-isomorphic multiset partitions of weight n with no constant parts and only two distinct vertices.at n=27A323654