0,2

a(n) = A003415(A011557(n)) = A008589(n)*A011557(n-1).

a(n) = 7*n*10^(n-1).

Cf. A001787, A027471.

Adjacent sequences: A085705 A085706 A085707 this_sequence A085709 A085710 A085711

Sequence in context: A137463 A126156 A082162 this_sequence A054606 A070074 A051397

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 19 2003