A245317 Concatenate n-th composite integer with n.

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

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