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Search: id:A072723
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| A072723 |
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Integers which are exactly the concatenation of the first m odd numbers (A019519) divided by their sum (A000290 = m^2). |
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+0
4
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| 1, 15, 16764334957, 3079163563531047898532266016633501
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A probability argument suggests that this sequence may be finite.
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EXAMPLE
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a(1) = 1/1 = 1; a(2) = 135/(1+3+5) = 15; a(3) = 1357911131517/(1+3+5+7+9+11+13+15+17) = 16764334957; a(4) = 1357911131517192123252729313335373941/(1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41) = 3079163563531047898532266016633501.
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CROSSREFS
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Cf. A067122, A072724, A072725.
Sequence in context: A013874 A068252 A115242 this_sequence A111413 A072838 A023919
Adjacent sequences: A072720 A072721 A072722 this_sequence A072724 A072725 A072726
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KEYWORD
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base,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Jul 06 2002
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