130827

Appears in sequences

• Starting with a(0) = 1, smallest squarefree number k such that, for all a(m), m < n, k + a(m) is not squarefree.at n=15A077225
• Starting with a(0)=5, a(n) = smallest squarefree number k such that, for all a(m) with m<n, k+a(m) is not squarefree.at n=17A080797
• Numbers belonging to both A077225 and A080797 (in the order in which they appear in A077225).at n=7A090627
• G.f.: Sum_{n>=0} x^n * (1+x)^(n*(n+1)/2) / Product_{k=1..n} (1 + x*(1+x)^k).at n=15A221547