A177269 a(n) = 1 + sum{k=1 to n} A177268(k)

2, 4, 8, 16, 28, 64, 70, 100, 162, 1024, 1035, 4096, 8192, 16384, 16401, 65536, 65596, 262144, 262192, 263169, 269312, 4194304, 4194325, 4477456, 4493312, 4498641, 4498752, 268435456, 268437200, 1073741824, 1073741834, 1088472064

Offset

2,1

Comments

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.

Links

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

Crossrefs

Cf. A175350, A175351, A177268

Sequence in context: A330289 A348413 A355968 * A018726 A049884 A085583

Adjacent sequences: A177266 A177267 A177268 * A177270 A177271 A177272

Keyword

nonn

Author

Hugo van der Sanden, May 06 2010

Status

approved