A098130 Concatenation of consecutive primes in the forward and reverse order.

22, 2332, 235532, 23577532, 235711117532, 2357111331117532, 23571113177131117532, 235711131719917131117532, 2357111317192332917131117532, 23571113171923299232917131117532, 235711131719232931139232917131117532, 2357111317192329313773139232917131117532

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Example

2332 is derived by concatenating the first two primes (2 and 3) in the "forward" order and the last two digits are the same primes in the "reverse" order.

Mathematica

Table[With[{cp=Flatten[IntegerDigits/@Prime[Range[n]]]}, FromDigits[Join[cp, Reverse[cp]]]], {n, 20}] (* Harvey P. Dale, Aug 18 2023 *)

Crossrefs

Sequence in context: A069221 A069222 A117990 * A078278 A231053 A078275

Adjacent sequences: A098127 A098128 A098129 * A098131 A098132 A098133

Keyword

easy,nonn,base

Author

Parthasarathy Nambi, Sep 27 2004

Extensions

Corrected and extended by Harvey P. Dale, Aug 18 2023

Status

approved