login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A020644 a(n)-th non-squarefree is sum of first k non-squarefrees for some k. 0
1, 4, 18, 53, 134, 154, 170, 319, 348, 373, 400, 460, 522, 552, 588, 661, 741, 858, 899, 985, 1033, 1081, 1275, 1324, 1375, 1769, 1829, 1949, 2143, 2276, 2475, 2687, 2988, 3063, 3222, 3304, 3384, 3466, 3553, 3636, 3724, 3994, 4085, 4469, 4561, 4663, 5055 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..47.

CROSSREFS

Cf. A013933, A013934, A013935.

Sequence in context: A092349 A027659 A059133 * A182031 A212250 A181411

Adjacent sequences:  A020641 A020642 A020643 * A020645 A020646 A020647

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Renaud Lifchitz (100637.64(AT)CompuServe.COM), David W. Wilson

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 24 22:42 EDT 2013. Contains 225631 sequences.