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Search: id:A131109
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| A131109 |
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a(n) is the smallest semiprime such that difference between a(n) and next semiprime, b(n), is n. |
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+0
4
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| 9, 4, 6, 10, 69, 15, 26, 169, 146, 237, 95, 1082, 818, 597, 1603, 2705, 2078, 4511, 1418, 2681, 14545, 13863, 37551, 6559, 16053, 55805, 26707, 17965, 308918, 32777, 41222, 35103, 393565, 219509, 153263, 87627, 2263057, 35981, 1789339, 741841, 797542
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe and Klaus Brockhaus, Table of n, a(n) for n=1..100
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FORMULA
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a(n) = A001358(A123375(n)) - T. D. Noe, Sep 28 2007
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EXAMPLE
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n, b(n)-a(n): 1=10-9, 2=6-4, 3=9-6, 4=14-10, 5=74-69, 6=21-15, 7=33-26, 8=177-169, 9=155-146, 10=247-237, 11=106-95, 12=1094-1082, 13=831-818, 14=611-597, 15=1618-1603, 16=2721-2705, 17=2095-2078, 18=4529-4511, 19=1437-1418, 20=2701-2681, 21=14566-14545, 22=13885-13863, 23=37574-37551, 24=6583-6559, 25=16078-16053, 26=55831-55805, 27=26734-26707, 28=17993-17965, 29=308947-308918, 30=32807-32777, 31=41253-41222, 32=35135-35103, 33=393598-393565, 34=219543-219509, 35=153298-153263, 36=87663-87627, a(37)>300000; 38=36019-35981.
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CROSSREFS
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Cf. A065516.
Sequence in context: A086240 A139720 A088539 this_sequence A116186 A011113 A021841
Adjacent sequences: A131106 A131107 A131108 this_sequence A131110 A131111 A131112
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 24 2007
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EXTENSIONS
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Corrected and extended by T. D. Noe and R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 28 2007
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