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Search: id:A107768
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| 30, 1309, 50209, 299423, 4329769, 4661471, 13968601, 19867823, 49402237, 90419171, 95575609, 230236057
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OFFSET
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1,1
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COMMENT
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Golden 3-almost primes.
Volumes of bricks (rectangular parallelopipeds) each of whose faces has golden semiprime area. How long a chain is possible of the form p(1) * p(2) * p(3) * ... * p(n) where each successive pair of values are factors of a golden semiprime? That is, if Zumkeller's golden semiprimes are the 2-dimensional case and the present sequence is the 3-dimensional case, is there a maximum n for an n-dimensional case?
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EXAMPLE
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30 = 2 * 3 * 5, where both 2*3=6 and 3*5=15 are golden semiprimes.
1309 = 7 * 11 * 17.
50209 = 23 * 37 * 59.
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CROSSREFS
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Cf. A014612, A108540, A108541, A108542.
Sequence in context: A060076 A163521 A002456 this_sequence A048536 A000173 A055351
Adjacent sequences: A107765 A107766 A107767 this_sequence A107769 A107770 A107771
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 11 2005
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