A066622 Concatenation of prime numbers in increasing order up to the n-th and then in decreasing order.
2, 232, 23532, 2357532, 2357117532, 23571113117532, 235711131713117532, 2357111317191713117532, 23571113171923191713117532, 235711131719232923191713117532, 2357111317192329312923191713117532
Offset: 1
Links
- Harvey P. Dale, Table of n, a(n) for n = 1..174
Programs
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Mathematica
Table[FromDigits[Flatten[IntegerDigits/@Join[Prime[Range[n]],Reverse[Most[Prime[Range[n]]]]]]],{n,12}] (* Harvey P. Dale, Oct 02 2022 *)
Extensions
More terms from Sascha Kurz, Mar 23 2002