A083272 a(n) = n*tau(a(n-1)) + 1 = n*A000005(a(n-1)) + 1, a(0) = 1.

1, 2, 5, 7, 9, 16, 31, 15, 33, 37, 21, 45, 73, 27, 57, 61, 33, 69, 73, 39, 81, 106, 89, 47, 49, 76, 157, 55, 113, 59, 61, 63, 193, 67, 69, 141, 145, 149, 77, 157, 81, 206, 169, 130, 353, 91, 185, 189, 385, 393, 201, 205, 209, 213, 217, 221, 225, 514, 233, 119, 241, 123, 249

Offset: 0

Author

Labos Elemer, May 14 2003

Keywords

• easy
• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A000005, A083271.

Programs

Mathematica

h[x_] := x*DivisorSigma[0, h[x-1]]+1; h[0] = 1; Table[h[w], {w, 0, 100}]
nxt[{n_,a_}]:={n+1, (n+1)DivisorSigma[0,a]+1}; NestList[nxt,{0,1},70][[All,2]] (* Harvey P. Dale, Feb 06 2020 *)