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A084126 Prime factor <= other prime factor of n-th semiprime. +0
12
2, 2, 3, 2, 2, 3, 3, 2, 5, 2, 3, 2, 5, 2, 3, 2, 7, 3, 5, 3, 2, 2, 5, 3, 2, 7, 2, 5, 2, 3, 7, 3, 2, 5, 2, 3, 5, 2, 7, 11, 2, 3, 3, 7, 2, 3, 2, 11, 5, 2, 5, 2, 3, 7, 2, 13, 3, 2, 3, 5, 11, 2, 3, 2, 7, 5, 2, 11, 3, 2, 5, 7, 2, 3, 13, 2, 5, 3, 13, 3, 11, 2, 7, 2, 5, 3, 2, 2, 7, 17, 3, 5, 2, 13, 7, 2, 3, 5, 3, 2 (list; graph; listen)
OFFSET

1,1

COMMENT

a(n)=A020639(A001358(n))=n/A006530(A001358(n)); A001358(n)=a(n)*A084127(n).

LINKS

Zak Seidov, Table of n, a(n) for n = 1..1000

Eric Weisstein's World of Mathematics, Semiprime

CROSSREFS

Cf. A068318, A087718, A087794, A089994, A089995, A096916, A106550, A106554, A108541, A131284, A138510, A138511.

Adjacent sequences: A084123 A084124 A084125 this_sequence A084127 A084128 A084129

Sequence in context: A001918 A002233 A074595 this_sequence A135975 A136032 A140361

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2003

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Last modified November 21 00:02 EST 2008. Contains 150810 sequences.


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