|
|
A019553
|
|
a(n) is the concatenation of n and 5n.
|
|
9
|
|
|
15, 210, 315, 420, 525, 630, 735, 840, 945, 1050, 1155, 1260, 1365, 1470, 1575, 1680, 1785, 1890, 1995, 20100, 21105, 22110, 23115, 24120, 25125, 26130, 27135, 28140, 29145, 30150, 31155, 32160, 33165, 34170, 35175, 36180, 37185, 38190, 39195, 40200
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
MAPLE
|
a:=n->n*10^floor(log10(5*n)+1)+5*n: seq(a(n), n=1..50); # Muniru A Asiru, Jun 23 2018
|
|
MATHEMATICA
|
n5n[n_]:=Module[{n5=5n}, n*10^IntegerLength[n5]+n5]; Array[n5n, 40] (* Harvey P. Dale, Apr 08 2012 *)
nxt[n_]:=Module[{idn=IntegerDigits[n], idn5=IntegerDigits[5n]}, FromDigits[Join[idn, idn5]]]; Array[nxt, 100] (* Vincenzo Librandi, Feb 04 2014 *)
|
|
PROG
|
(Magma) [Seqint(Intseq(5*n) cat Intseq(n)): n in [1..50]]; // Vincenzo Librandi, Feb 04 2014
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base,easy,less
|
|
AUTHOR
|
R. Muller
|
|
STATUS
|
approved
|
|
|
|