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A009470
a(n) is the concatenation of n and 8n.
10
18, 216, 324, 432, 540, 648, 756, 864, 972, 1080, 1188, 1296, 13104, 14112, 15120, 16128, 17136, 18144, 19152, 20160, 21168, 22176, 23184, 24192, 25200, 26208, 27216, 28224, 29232, 30240, 31248, 32256, 33264, 34272, 35280, 36288, 37296, 38304, 39312
OFFSET
1,1
COMMENTS
All terms are divisible by 9. - Michel Marcus, Sep 21 2015
LINKS
MATHEMATICA
nxt[n_]:=Module[{idn=IntegerDigits[n], idn8=IntegerDigits[8n]}, FromDigits[Join[idn, idn8]]]; Array[nxt, 100] (* Vincenzo Librandi, Feb 04 2014 *)
PROG
(Magma) [Seqint(Intseq(8*n) cat Intseq(n)): n in [1..50]]; // Vincenzo Librandi, Feb 04 2014
(PARI) a(n) = eval(Str(n, 8*n)); \\ Michel Marcus, Sep 21 2015
CROSSREFS
Cf. concatenation of n and k*n: A020338 (k=1), A019550 (k=2), A019551 (k=3), A019552 (k=4), A019553 (k=5), A009440 (k=6), A009441 (k=7), this sequence (k=8), A009474 (k=9).
Sequence in context: A021764 A059357 A324638 * A111991 A081136 A101188
KEYWORD
nonn,base,less,easy
STATUS
approved