214712

Appears in sequences

• a(1) = 1, a(n+1) = a(n) + gpf(Sum_{i=1..n} a(i)), where gpf=A006530 (greatest prime factor).at n=27A080182
• Discriminants of real quadratic number fields with 3-class rank 2.at n=20A269318
• Discriminants of real quadratic fields with 3-class group of type (3,3).at n=20A269319
• Minimal discriminants d of real quadratic number fields K = Q(sqrt(d)), d > 0, with elementary bicyclic 3-class group Cl_3(K)=(3,3) and second 3-class group M=Gal(F_3^2(K)/K) of assigned coclass cc(M)=1,2,3,4,...at n=1A379524