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Search: id:A086556
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| A086556 |
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a(1) = 1, then numbers coprime to all previous terms such that tau(a(n)) = n, where tau(k) = number of divisors of k. |
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1
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| 1, 2, 9, 35, 14641, 2873, 47045881, 20677, 2301289, 160683647, 174887470365513049, 14226847, 16409682740640811134241, 11955403876831, 375917360641, 107972737, 397030588105939686862303733490241, 26979607331
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OFFSET
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1,2
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EXAMPLE
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a(5) = 11^4, tau(14641) = 5 and a(6)= 2873 = 13^2*17 and tau(2873) = 6.
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CROSSREFS
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Adjacent sequences: A086553 A086554 A086555 this_sequence A086557 A086558 A086559
Sequence in context: A092431 A077837 A110224 this_sequence A073989 A134759 A007946
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 29 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Mar 25 2005
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