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A087794 Products of prime-indices of factors of semiprimes. 4
1, 2, 4, 3, 4, 6, 8, 5, 9, 6, 10, 7, 12, 8, 12, 9, 16, 14, 15, 16, 10, 11, 18, 18, 12, 20, 13, 21, 14, 20, 24, 22, 15, 24, 16, 24, 27, 17, 28, 25, 18, 26, 28, 32, 19, 30, 20, 30, 30, 21, 33, 22, 32, 36, 23, 36, 34, 24, 36, 36, 35, 25, 38, 26, 40, 39, 27, 40, 40, 28, 42, 44, 29 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A049084(A084126(n))*A049084(A084127(n)) = A003963(A001358(n)).

LINKS

Table of n, a(n) for n=1..73.

EXAMPLE

A001358(20)=57=3*19=A000040(2)*A000040(8), therefore a(20)=2*8=16.

CROSSREFS

Sequence in context: A089169 A291563 A178151 * A050514 A229047 A133702

Adjacent sequences:  A087791 A087792 A087793 * A087795 A087796 A087797

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 09 2003

STATUS

approved

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Last modified May 24 18:34 EDT 2019. Contains 323534 sequences. (Running on oeis4.)