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A007943 Concatenation of sequence (1,3,..,2n-1,2n,2n-2,..,2). 1
12, 1342, 135642, 13578642, 13579108642, 135791112108642, 1357911131412108642, 13579111315161412108642, 135791113151718161412108642, 1357911131517192018161412108642 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
M. Le, Perfect Powers in the Smarandache Permutation Sequence, Smarandache Notions Journal, Vol. 10, No. 1-2-3, 1999, 148-149.
LINKS
MATHEMATICA
Table[FromDigits[Join[Flatten[IntegerDigits/@Range[1, 2n+1, 2]], Flatten[ IntegerDigits/@ Range[2n+2, 2, -2]]]], {n, 0, 10}] (* Harvey P. Dale, Jul 30 2021 *)
CROSSREFS
Cf. A007942.
Sequence in context: A071309 A067108 A240627 * A015512 A004145 A296609
KEYWORD
nonn,base
AUTHOR
R. Muller
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)