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Search: id:A113937
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| 1, 9801, 16008300, 94109401, 34346991901, 270990840125, 903638458801, 8676736387298001
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(9) > 2^63. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 07 2008]
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EXAMPLE
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94109401=7921*(3*7921)/2 is the 7921st pentagonal number and 94109401=89^2*109^2.
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CROSSREFS
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Cf. A001694, A000326.
Adjacent sequences: A113934 A113935 A113936 this_sequence A113938 A113939 A113940
Sequence in context: A069333 A156721 A156735 this_sequence A036353 A031687 A031597
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KEYWORD
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nonn
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AUTHOR
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Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006
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EXTENSIONS
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a(8) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Dec 07 2008
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