2,1

The number of divisors of a(n) is n.

a(n+1)-a(n) does not equal a(m+1)-a(m) for any m not equal to n, n and m >= 2.

This is analogous to A175351(n) with a(1)=1, a(2)=2.

Table of n, a(n) for n=2..33.

Cf. A175350, A175351, A177268

Sequence in context: A127195 A255937 A330289 * A018726 A049884 A085583

Adjacent sequences: A177266 A177267 A177268 * A177270 A177271 A177272

nonn

Hugo van der Sanden, May 06 2010

approved