|
| |
|
|
A084127
|
|
Prime factor >= other prime factor of n-th semiprime.
|
|
25
| |
|
|
2, 3, 3, 5, 7, 5, 7, 11, 5, 13, 11, 17, 7, 19, 13, 23, 7, 17, 11, 19, 29, 31, 13, 23, 37, 11, 41, 17, 43, 29, 13, 31, 47, 19, 53, 37, 23, 59, 17, 11, 61, 41, 43, 19, 67, 47, 71, 13, 29, 73, 31, 79, 53, 23, 83, 13, 59, 89, 61, 37, 17, 97, 67, 101, 29, 41, 103, 19, 71, 107, 43, 31
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| a(n)=A006530(A001358(n))=n/A020639(A001358(n)); A001358(n)=A084126(n)*a(n).
Largest nontrivial divisor of n-th semiprime. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Apr 18 2010]
|
|
|
LINKS
| Zak Seidov, Table of n, a(n) for n = 1..1000
Eric Weisstein's World of Mathematics, Semiprime
|
|
|
CROSSREFS
| Cf. A014673, A061299, A068318, A087718, A087794, A089994, A089995, A096932, A106550, A106554, A108542, A126663, A131284, A138510, A138511. current versions:.
Sequence in context: A122444 A066072 A180611 * A089934 A113460 A113470
Adjacent sequences: A084124 A084125 A084126 * A084128 A084129 A084130
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2003
|
|
|
EXTENSIONS
| Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 15 2006
|
| |
|
|
