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Search: id:A076995
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| A076995 |
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a(1) = 4, a(n+1) is the largest composite number < 2a(n). |
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| 4, 6, 10, 18, 35, 69, 136, 270, 539, 1077, 2152, 4303, 8605, 17208, 34415, 68829, 137657, 275313, 550625, 1101249, 2202497, 4404993, 8809985, 17619969, 35239936, 70479871, 140959741, 281919481, 563838961, 1127677921, 2255355841
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OFFSET
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1,1
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MAPLE
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a[1] := 4:for n from 2 to 84 do q := 2*a[n-1]-1:while(isprime(q)) do q := q-1:od: a[n] := q:od:seq(a[l], l=1..84);
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CROSSREFS
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Cf. A006992, A076994.
Sequence in context: A108232 A027976 A108900 this_sequence A096817 A077065 A131867
Adjacent sequences: A076992 A076993 A076994 this_sequence A076996 A076997 A076998
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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), Oct 26 2002
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EXTENSIONS
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Corrected and extended by Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 26 2003
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