A032612 Concatenation of n and n+7.
18, 29, 310, 411, 512, 613, 714, 815, 916, 1017, 1118, 1219, 1320, 1421, 1522, 1623, 1724, 1825, 1926, 2027, 2128, 2229, 2330, 2431, 2532, 2633, 2734, 2835, 2936, 3037, 3138, 3239, 3340, 3441, 3542, 3643, 3744, 3845, 3946, 4047, 4148, 4249
Offset: 1
Programs
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Mathematica
Table[n*10^IntegerLength[n+7]+n+7,{n,50}] (* Harvey P. Dale, Apr 26 2025 *) -
Python
def A032612(n): return n*(10**len(str(n+7))+1)+7 # Chai Wah Wu, Jun 29 2025