129599

Appears in sequences

• Numbers n such that core(n)=floor(sqrt(n)), where core(x)=A007913(x) is the squarefree part of x and floor(sqrt(x))=A000196(x).at n=24A069186
• a(n) = (n^2-1)^2-1.at n=19A178392
• Increasing a(n)is the smallest number of the form p^a*q^b, where a,b are positive integers and p < q are odd primes such that max( p^a, q^b)/min( p^a, q^b) <= 1 + 2/prime(n).at n=38A229108
• Expansion of e.g.f.: exp((1-x)*(1-x^2)*(1-x^3)*(1-x^4)*(1-x^5) - 1).at n=9A294258