login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A183217 Complement of the pentagonal numbers. 3
2, 3, 4, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 93 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n)= n+Floor[1/2+(2n/3)^(1/2)].
EXAMPLE
The pentagonal numbers: A000326=(1,5,12,22,35,...), so that A183217=(2,3,4,6,7,8,9,10,11,13,14,...).
MATHEMATICA
Table[n+Floor[1/2+(2n/3)^(1/2)], {n, 100}]
CROSSREFS
Cf. A000326.
Sequence in context: A048263 A141451 A285211 * A047303 A057906 A039214
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 01 2011
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 29 20:48 EST 2024. Contains 370428 sequences. (Running on oeis4.)