A134072 - OEIS

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A134072

Concatenation of A000204 Lucas numbers (beginning at 1) in reverse order.

1, 31, 431, 7431, 117431, 18117431, 2918117431, 472918117431, 76472918117431, 12376472918117431, 19912376472918117431, 32219912376472918117431, 52132219912376472918117431, 84352132219912376472918117431

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OFFSET

1,2

COMMENTS

Indices of prime terms are {2, 3, 5, 11, ...}. Primes are listed in A134071 = {31, 431, 117431, 19912376472918117431, ...}.

LINKS

Table of n, a(n) for n=1..14.

Eric Weisstein's World of Mathematics, Lucas Number

Eric Weisstein's World of Mathematics, Smarandache Sequences

MATHEMATICA

Module[{nn=20, lnos}, lnos=LucasL[Range[nn]]; Table[FromDigits[Flatten[ IntegerDigits/@ Reverse[Take[lnos, n]]]], {n, nn}]] (* Harvey P. Dale, Jul 27 2015 *)

CROSSREFS

Cf. A000204 (Lucas numbers).

Cf. A130774 (concatenation of Lucas numbers).

Cf. A019523 (concatenation of Fibonacci numbers).

Cf. A038399 (concatenation of first n nonzero Fibonacci numbers in reverse order).

Cf. A134069 (primes in A038399).

Cf. A134070 (primes in A130774).

Cf. A134071 (primes in A134072).

Sequence in context: A274202 A352606 A089561 * A134071 A278964 A010836

Adjacent sequences: A134069 A134070 A134071 * A134073 A134074 A134075

KEYWORD

nonn,base

AUTHOR

Alexander Adamchuk, Oct 06 2007

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 26 2010

STATUS

approved