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Search: id:A133454
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| A133454 |
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Chain of 6 highly composite numbers generated when subject to the recurrence relation tau(a(n+1)) = a(n),with a(0)=3, where tau(n) is the number-of-divisors function A000005(n). |
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+0
1
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OFFSET
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1,1
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EXAMPLE
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Since 4 is the HCN with 3 divisors, we have tau(4) = 3 and therefore a(1)=4 ; The HCN with 4 divisors is 6, so that tau(6) = 4 and hence a(2)=6 ; The HCN with 6 divisors is 12 so that tau(12) = 6,implying a(3)=12,...
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CROSSREFS
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Cf. A002182.
Sequence in context: A154666 A050537 A068507 this_sequence A061072 A130435 A028444
Adjacent sequences: A133451 A133452 A133453 this_sequence A133455 A133456 A133457
Cf. A009287. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 26 2010]
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KEYWORD
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fini,full,nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Dec 22 2007
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