264160

Appears in sequences

• Numbers k such that phi(k) = Sum_{d|k} core(d) where core(x) is the squarefree part of x (A007913).at n=23A074786
• Numbers n such that sigma(n) = 7*phi(n).at n=20A136540
• Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 6 times.at n=4A144320
• Square array A(n,k), n>=1, k>=1, read by antidiagonals, with A(1,k)=1 and sequence a_k of column k shifts left when Dirichlet convolution (DC:(b,b)->a) applied k times.at n=49A144324
• Even octagonal pyramidal numbers (A002414).at n=31A218327