|
Search: id:A061111
|
|
|
| A061111 |
|
a(1) = 1; a(n) = smallest number such that the concatenation a(1).0^*.a(2).0^*....0^*.a(n) is a perfect cube (where any number of 0's can be inserted between the terms). |
|
+0
1
|
| |
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Comment from N. J. A. Sloane (njas(AT)research.att.com), Jul 21, 2001: The implication is that 10...01, 10...02, 10...03, ..., 10...024 are never cubes for any number of internal zeros, while 125 IS a cube, so a(2) = 25.
|
|
REFERENCES
|
Amarnath Murthy, Exploring some new ideas on Smarandache type sets, functions and sequences, Smarandache Notions Journal Vol. 11, No. 1-2-3, Spring 2000.
|
|
LINKS
|
M. L. Perez et al., eds., Smarandache Notions Journal
|
|
EXAMPLE
|
a(1) = 1, a(1)a(2) = 125 = 5^3, a(1)a(2)a(3) = 1259712 = 108^3, a(1)a(2)a(3)0a(4) = 5012916^3.
|
|
CROSSREFS
|
Cf. A061109 A051671, A061110.
Sequence in context: A036512 A053860 A091744 this_sequence A082211 A053766 A034711
Adjacent sequences: A061108 A061109 A061110 this_sequence A061112 A061113 A061114
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 20 2001
|
|
|
Search completed in 0.002 seconds
|
