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!)
A245317 Concatenate n-th composite integer with n. 2
41, 62, 83, 94, 105, 126, 147, 158, 169, 1810, 2011, 2112, 2213, 2414, 2515, 2616, 2717, 2818, 3019, 3220, 3321, 3422, 3523, 3624, 3825, 3926, 4027, 4228, 4429, 4530, 4631, 4832, 4933, 5034, 5135, 5236, 5437, 5538, 5639, 5740 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Jens Kruse Andersen, Table of n, a(n) for n = 1..10000

EXAMPLE

a(8)=158 since 15 is the 8th composite integer.

MATHEMATICA

w=Select[Range[2, 57], !PrimeQ[#]&]; Table[FromDigits[Flatten[{IntegerDigits[w[[n]]], IntegerDigits[n]}]], {n, 1, 40}]

CROSSREFS

Cf. A002808, A245315, A245316, A246808.

Sequence in context: A089345 A320468 A055110 * A039524 A259586 A140374

Adjacent sequences:  A245314 A245315 A245316 * A245318 A245319 A245320

KEYWORD

nonn,base

AUTHOR

Jahangeer Kholdi, Sep 15 2014

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 August 8 12:30 EDT 2022. Contains 356009 sequences. (Running on oeis4.)