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

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