A177268 a(n) = the smallest positive integer not yet occurring such that the number of divisors of 1+sum{k=1 to n} a(k) is exactly n.

1, 2, 4, 8, 12, 36, 6, 30, 62, 862, 11, 3061, 4096, 8192, 17, 49135, 60, 196548, 48, 977, 6143, 3924992, 21, 283131, 15856, 5329, 111, 263936704, 1744, 805304624, 10, 14730230, 670720, 18082841, 50, 67612251061, 786432, 99913728, 80

Offset

2,2

Comments

It seems possible that this is a permutation of the positive integers. Is it?

This is analogous to A175350(n) with a(1)=a(2)=1.

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

Links

Table of n, a(n) for n=2..40.

Crossrefs

Cf. A175350, A177269

Sequence in context: A105207 A202148 A215825 * A379459 A289085 A242924

Adjacent sequences: A177265 A177266 A177267 * A177269 A177270 A177271

Keyword

nonn

Author

Hugo van der Sanden, May 06 2010

Status

approved