OFFSET
1,1
COMMENTS
A134072 = {1, 31, 431, 7431, 117431, 18117431, 2918117431, 472918117431, 76472918117431, 12376472918117431, 19912376472918117431, ...} = concatenation of Lucas numbers in reverse order. Indices of prime terms in A134072 are {2, 3, 5, 11, ...}.
No further terms through 500 Lucas numbers. - Harvey P. Dale, Aug 17 2013
LINKS
Eric Weisstein's World of Mathematics, Lucas Number
Eric Weisstein's World of Mathematics, Smarandache Sequences
MATHEMATICA
nn=500; With[{lucs=LucasL[Range[nn]]}, Select[Table[FromDigits[ Flatten[ IntegerDigits/@ Reverse[ Take[lucs, n]]]], {n, nn}], PrimeQ]] (* Harvey P. Dale, Aug 17 2013 *)
CROSSREFS
KEYWORD
hard,more,nonn,base
AUTHOR
Alexander Adamchuk, Oct 06 2007
EXTENSIONS
Edited by Charles R Greathouse IV, Apr 24 2010
STATUS
approved