|
Search: id:A085631
|
|
|
| A085631 |
|
Let b(n)=product of exponents of prime factorization of n. Sequence gives palindromes n such that b(n) is also palindromic and sets a new record. |
|
+0
1
|
|
| 1, 4, 8, 252, 2112, 4224, 8448, 29592, 6547456, 27011072, 291080192, 276444444672, 2789387839872, 6399369639936
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
No more terms < 1.45*10^14. - David Wasserman (wasserma(AT)spawar.navy.mil), Feb 07 2005
|
|
EXAMPLE
|
a(9)=6547456 because it is a palindrome and 6547456 = 2^11*23*139 and
11*1*1=11 a palindrome.
|
|
CROSSREFS
|
Cf. A005361.
Sequence in context: A013065 A013096 A116092 this_sequence A074073 A090653 A065022
Adjacent sequences: A085628 A085629 A085630 this_sequence A085632 A085633 A085634
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Jason Earls and Amarnath Murthy (zevi_35711(AT)yahoo.com), Jul 10 2003
|
|
EXTENSIONS
|
More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 07 2005
|
|
|
Search completed in 0.002 seconds
|
