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A102281
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a(n) is the largest number m such that m = pi(n*m).
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5
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4, 11, 30, 72, 189, 442, 1059, 2700, 6472, 15927, 40121, 100363, 251761, 637340, 1617174, 4124705, 10553853, 27067277, 69709965, 179993173, 465769838, 1208198861, 3140421934, 8179002208, 21338685406, 55762149115, 145935689393
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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COMMENTS
| All known terms of this sequence satisfy the relation 2.4*a(n) - 12 < a(n+1) < 2.7*a(n) + 1 is true.
a(n) is the largest number m such that floor(prime(m)/m)=n-1. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Sep 13 2005
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EXAMPLE
| 3140421934 = pi(24*3140421934) and 3140421934 is the largest number with this property, so a(24) = 3140421934.
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CROSSREFS
| Cf. A038626, A038627, A087237.
Sequence in context: A110579 A084378 A099065 * A026583 A110034 A114726
Adjacent sequences: A102278 A102279 A102280 * A102282 A102283 A102284
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KEYWORD
| nonn
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AUTHOR
| Farideh Firoozbakht (mymontain(AT)yahoo.com), Jan 09 2005; extended Sep 13 2005
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EXTENSIONS
| a(24) corrected by Max Alekseyev (maxale(AT)gmail.com), Jul 18 2011
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