|
| |
|
|
A106551
|
|
a(n) = n-th semiprime + (concatenation of its two divisors, largest divisor first).
|
|
0
| |
|
|
26, 38, 41, 62, 86, 65, 94, 134, 80, 158, 146, 206, 110, 230, 172, 278, 128, 224, 170, 250
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Concatenation of the divisors starting with the smallest one leads to a different sequence.
|
|
|
EXAMPLE
| First semiprime is 4; 4 is 2*2; 26=4+22.
Second semiprime is 6; 6 is 3*2; 38=6+32.
Third semiprime is 9; 9 is 3*3; 41=9+33.
Fourth semiprime is 10; 10 is 5*2; 62=10+52.
|
|
|
CROSSREFS
| Sequence in context: A034096 A034106 A171745 * A106553 A045092 A178662
Adjacent sequences: A106548 A106549 A106550 * A106552 A106553 A106554
|
|
|
KEYWORD
| base,easy,nonn
|
|
|
AUTHOR
| Eric Angelini (eric.angelini(AT)kntv.be), May 09 2005
|
|
|
EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 29 2007
|
| |
|
|
