Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A105434
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A105434 a(1)=1. a(n+1) = a(n) + (number of terms, from among the first n terms of the sequence, which occur among (d(a(1)),d(a(2)),d(a(3)),...d(a(n))), where d(n) = A000005(n)). +0
2
1, 2, 4, 6, 9, 12, 16, 20, 24, 28, 32, 36, 41, 46, 51, 56, 61, 66, 71, 76, 81, 86, 91, 96, 102, 108, 114, 120, 127, 134, 141, 148, 155, 162, 169, 176, 183, 190, 197, 204, 211, 218, 225, 232, 239, 246, 253, 260, 267, 274, 281, 288, 295, 302, 309, 316, 323, 330, 337 (list; graph; listen)
OFFSET

1,2

MATHEMATICA

f[l_] := Append[l, l[[ -1]] + Count[MemberQ[l, # ] & /@ Union@DivisorSigma[0, l], True]]; Nest[f, {1}, 58]

CROSSREFS

Cf. A000005. A variant of A130798.

Sequence in context: A155752 A145801 A033291 this_sequence A145196 A061536 A095114

Adjacent sequences: A105431 A105432 A105433 this_sequence A105435 A105436 A105437

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 26 2007

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | The OEIS Foundation | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified March 15 12:29 EDT 2010. Contains 173428 sequences.


AT&T Labs Research