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Search: id:A073771
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| A073771 |
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Highly composite numbers n such that 2*n is not a highly composite number. |
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+0
3
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| 4, 36, 48, 240, 720, 1680, 15120, 20160, 45360, 50400, 221760, 498960, 554400, 665280, 2882880, 6486480, 14414400, 17297280, 32432400, 43243200, 110270160, 245044800, 294053760, 735134400, 2095133040, 2205403200, 4655851200
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The terms were determined by means of A. Flammenkamp's list (cf. Links), the terms <= 17297280 were confirmed by a PARI program.
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LINKS
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Achim Flammenkamp Highly Composite Numbers
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EXAMPLE
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36 = A002182(7) is a term since 2*36 = 72 is not highly composite.
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PROGRAM
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(PARI) {a=1; v=[1]; for(k=1, 40000000, b=numdiv(k); if(b>a, a=b; v=concat(v, k); while(2*v[1]<=k, if(2*v[1]<k, print1(v[1], ", ")); v=vecextract(v, "2.."))))}
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CROSSREFS
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Cf. A002182, A072938.
Sequence in context: A092960 A027644 A062182 this_sequence A091722 A053939 A072157
Adjacent sequences: A073768 A073769 A073770 this_sequence A073772 A073773 A073774
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KEYWORD
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nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 19 2002
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