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Search: id:A122123
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| 32, 1536, 110592, 8847360, 955514880, 107017666560, 12842119987200, 2080423437926400, 349511137571635200, 61513960212607795200, 11072512838269403136000, 2214502567653880627200000
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OFFSET
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1,1
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COMMENT
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5-almost prime analogue of primorial (A002110). The semiprime analogue of primorial is A112141. Equivalent for product of what A086047 is for sum. Bigomega(a(n)) = the number of not necessarily distinct prime factors of a(n) = A001222(a(n)) = A008587(n) = 5*n.
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FORMULA
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a(n) = Prod[i=1..n] A014614(i).
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EXAMPLE
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a(10) = 32 * 48 * 72 * 80 * 108 * 112 * 120 * 162 * 168 * 176 = 2^33 * 3^12 * 5^2 * 7^2 * 11 which has 50 prime factors with multiplicity.
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CROSSREFS
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Cf. A001222, A002110, A008585, A014613, A008587, A086046, A086047, A112141, A114426.
Sequence in context: A114933 A038097 A038096 this_sequence A013994 A079202 A085526
Adjacent sequences: A122120 A122121 A122122 this_sequence A122124 A122125 A122126
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost2(AT)yahoo.com), Oct 19 2006
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