|
Search: id:A135372
|
|
|
| A135372 |
|
Highly composite numbers + 1. |
|
+0
1
|
|
| 2, 3, 5, 7, 13, 25, 37, 49, 61, 121, 181, 241, 361, 721, 841, 1261, 1681, 2521, 5041, 7561, 10081, 15121, 20161, 25201, 27721, 45361, 50401, 55441, 83161, 110881, 166321, 221761, 277201, 332641, 498961, 554401, 665281, 720721, 1081081
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
a(n) prime for n = 1, 2, 3, 4, 5, 7, 9, 11, 12, 18, 20, 22, 23, 26, 28, 30, 34, 35, ... a(n) square of prime for n = 6, 8, 10, 13, 15, 17, 19, ... a(n) is not a prime power for n = 14 (semiprime), 16 (semiprime), 21 (semiprime), 24 (3-almost prime), 25 (semiprime), 27 (semiprime), 29 (semiprime), 31 (semiprime), 32 (semiprime), 33 (semiprime), 36 (semiprime), 37 (semiprime), 38 (semiprime), 39 (3-almost prime), 40 (semiprime), 41 (semiprime).
|
|
FORMULA
|
a(n) = A002182(n)+1.
|
|
CROSSREFS
|
Cf. A000040, A001248, A002182.
Sequence in context: A080190 A076994 A124147 this_sequence A103597 A037021 A114741
Adjacent sequences: A135369 A135370 A135371 this_sequence A135373 A135374 A135375
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Jonathan Vos Post (jvospost3(AT)gmail.com), Dec 09 2007
|
|
|
Search completed in 0.002 seconds
|
