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A206528 5^n concatenated with itself. 2
11, 55, 2525, 125125, 625625, 31253125, 1562515625, 7812578125, 390625390625, 19531251953125, 97656259765625, 4882812548828125, 244140625244140625, 12207031251220703125, 61035156256103515625, 3051757812530517578125, 152587890625152587890625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) = A020338(5^n).

EXAMPLE

a(1)=55 because 5^1 concatenated with 5^1 is 55.

MATHEMATICA

Table[FromDigits[Join[IntegerDigits[5^n], IntegerDigits[5^n]]], {n, 0, 20}]

PROG

(MAGMA) [Seqint(Intseq(5^n) cat Intseq(5^n)): n in [0..20]];

CROSSREFS

Cf. A000351, A178664, A206527.

Sequence in context: A165791 A032166 A218000 * A259193 A099532 A041226

Adjacent sequences:  A206525 A206526 A206527 * A206529 A206530 A206531

KEYWORD

nonn,base,easy

AUTHOR

Vincenzo Librandi, Mar 17 2012

STATUS

approved

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Last modified November 16 17:32 EST 2018. Contains 317275 sequences. (Running on oeis4.)