|
| |
|
|
A100493
|
|
n + n-th semiprime.
|
|
6
| |
|
|
5, 8, 12, 14, 19, 21, 28, 30, 34, 36, 44, 46, 48, 52, 54, 62, 66, 69, 74, 77, 79, 84, 88, 93, 99, 103, 109, 113, 115, 117, 122, 125, 127, 129, 141, 147, 152, 156, 158, 161, 163, 165, 172, 177, 179, 187, 189, 191, 194, 196, 206, 210, 212, 215, 221, 225, 234, 236
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| This is the semiprime analogue of A014688.
|
|
|
LINKS
| Eric Weisstein, World of Mathematics, Semiprime.
|
|
|
FORMULA
| a(n) = n + A001358(n).
a(n) ~ n log n / log log n. [Charles R Greathouse IV, Dec 28 2011]
|
|
|
EXAMPLE
| a(7) = 7 + semiprime(7) = 7 + 21 = 28.
|
|
|
CROSSREFS
| Cf. A001358, A014688, A100466, A100467, A100915, A100916.
Sequence in context: A124378 A066299 A161394 * A005661 A190773 A184915
Adjacent sequences: A100490 A100491 A100492 * A100494 A100495 A100496
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 20 2004
|
|
|
EXTENSIONS
| Edited, corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 26 2004
|
| |
|
|
