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Search: id:A147550
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| A147550 |
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a(n) is the smallest n-digit number m such that there is no n-digit number t with phi(t)<phi(m). |
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+0
2
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| 1, 10, 102, 1050, 10080, 101010, 1021020, 10210200, 100150050, 1009788780
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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For all natural numbers n, A147551(n)=phi(A147550(n)).
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EXAMPLE
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phi(10)=4 and there is no 2-digit number t such that phi(t)<4 so a(2)=10. phi(102)=32 and there is no 3-digit number t such that phi(t)<32 also phi(100) and phi(101) are greater than 32, so a(3)=102.
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CROSSREFS
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Cf. A147551.
Sequence in context: A038378 A158242 A147636 this_sequence A162666 A061630 A062806
Adjacent sequences: A147547 A147548 A147549 this_sequence A147551 A147552 A147553
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KEYWORD
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base,hard,more,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 22 2008
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