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!)
A004158 Triangular numbers written backwards. 4
0, 1, 3, 6, 1, 51, 12, 82, 63, 54, 55, 66, 87, 19, 501, 21, 631, 351, 171, 91, 12, 132, 352, 672, 3, 523, 153, 873, 604, 534, 564, 694, 825, 165, 595, 36, 666, 307, 147, 87, 28, 168, 309, 649, 99, 5301, 1801, 8211, 6711, 5221, 5721, 6231, 8731, 1341, 5841, 451 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(n) = A004086(A000217(n)). - Michel Marcus, Apr 05 2014
MAPLE
a:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||(n*(n+1)/2)):
seq(a(n), n=0..60); # Alois P. Heinz, Apr 09 2015
MATHEMATICA
Table[FromDigits[Reverse[IntegerDigits[n (n + 1) / 2]]], {n, 0, 50}] (* Vincenzo Librandi, Jan 21 2016 *)
PROG
(Magma) [Seqint(Reverse(Intseq(Binomial((n+1), 2)))): n in [0..60]]; // Vincenzo Librandi, Jan 21 2016
CROSSREFS
Sequence in context: A176230 A335227 A094445 * A221705 A332505 A303864
KEYWORD
nonn,base,look
AUTHOR
EXTENSIONS
Initial 0 and terms after a(46) from Eric M. Schmidt, Apr 04 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 March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)