|
Search: id:A085928
|
|
|
| A085928 |
|
a(1) = 1, a(2) = 2, then the absolute difference of the concatenation of two previous terms and its digit reversal. |
|
+0
1
|
|
| 1, 2, 9, 63, 594, 14058, 25627437, 5941439657604, 150482558208133815048, 2463743660424402357955859435526447, 5941429767504259381561776919813218438160375943419757604
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
a(n) is a multiple of 99 for n > 4. Conjecture: The sequence has finitely many nonzero terms. (This would happen when the concatenation of two successive terms becomes a palindrome and the next term is 0.)
|
|
EXAMPLE
|
a(1) = 1, a(2) = 2, a(3) = |12-21| = 9, a(4) = |29-92| = 63, a(5) = |963-369| = 594, a(6) = |63594 - 49536| = 14058, a(7) = |59418018 - 81081495| = 21663477, ...
|
|
CROSSREFS
|
Sequence in context: A100262 A166886 A003577 this_sequence A130169 A167913 A076944
Adjacent sequences: A085925 A085926 A085927 this_sequence A085929 A085930 A085931
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Amarnath Murthy and Jason Earls (amarnath_murthy(AT)yahoo.com), Jul 13 2003
|
|
EXTENSIONS
|
Corrected and extended by Mark Hudson (mrmarkhudson(AT)hotmail.com), Jul 23 2004
More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 11 2005
|
|
|
Search completed in 0.002 seconds
|
