A171959 a(1) = 0, for n >= 2; a(n) = the smallest number h such that tau(h) = A000005(h) = a(n-1) + 3.

0, 4, 64, 73786976294838206464

Offset: 1

Author

Jaroslav Krizek, Nov 06 2010

Keywords

• nonn

Comments

a(5) = 2^44210291368986342 * 3^1668 is too large to include.

Crossrefs

Cf. A014221, A173603, A173604, A173605, A173606, A173607, A173608, A173609, A173011.

Formula

A000005(a(n)) = a(n-1) + 3 for n >= 2.

For n>1, a(n) = A005179(a(n-1) + 3).