81532

Appears in sequences

• Numbers n such that phi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.at n=35A139408
• Number of ways to write n as an ordered sum of 10 nonzero triangular numbers.at n=35A340955
• Symmetric difference of the primitive non-deficient numbers and the primitive Zumkeller numbers.at n=31A378538
• Numbers that are primitive Zumkeller, but not primitive non-deficient.at n=22A378657