A066627 Concatenation of numbers k^k in increasing order up to the n-th and then in decreasing order.

1, 141, 142741, 14272562741, 142725631252562741, 142725631254665631252562741, 14272563125466568235434665631252562741, 1427256312546656823543167772168235434665631252562741

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Mathematica

Table[FromDigits[Join[Flatten[IntegerDigits/@Table[n^n, {n, k}]], Flatten[IntegerDigits/@Table[n^n, {n, k-1, 1, -1}]]]], {k, 10}] (* Harvey P. Dale, Jan 31 2024 *)

Crossrefs

Sequence in context: A172904 A164525 A153358 * A172668 A172764 A172836

Adjacent sequences: A066624 A066625 A066626 * A066628 A066629 A066630

Keyword

easy,nonn,base

Author

Amarnath Murthy, Dec 25 2001

Extensions

More terms from Sascha Kurz, Mar 23 2002

Status

approved