|
Search: id:A138838
|
|
|
| A138838 |
|
Concatenation of initial and final digits of n-th even superperfect number A061652(n), divided by 2. |
|
+0
2
|
|
| 11, 22, 8, 32, 23, 33, 12, 7, 8, 18, 42, 42
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Also, concatenation of initial and final digits of n-th superperfect number A019279(n), divided by 2, if there are no odd superperfect numbers.
Also, concatenation of A138124(n) and A138125(n), divided by 2.
|
|
EXAMPLE
|
a(5)=23 because the 5th even superperfect number A061652(5) is 4096 and the concatenation of initial and final digits of 4096 is 46 and 46/2 = 23.
|
|
CROSSREFS
|
Cf. A019279, A061652, A073729, A138124, A138125, A138842.
Adjacent sequences: A138835 A138836 A138837 this_sequence A138839 A138840 A138841
Sequence in context: A001388 A110393 A064263 this_sequence A139337 A040110 A048136
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Omar E. Pol (info(AT)polprimos.com), Apr 02 2008
|
|
|
Search completed in 0.002 seconds
|
