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Search: id:A048721
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| 0, 1, 3, 7, 23, 151, 4247, 1052823, 8590987415, 18014407100469399, 309485009839359475825250455, 11150372599265311880252868975683656578240663, 6901746346790563787434755873427398051716420852423255530846180802039959
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OFFSET
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0,3
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COMMENT
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Prime values of a(n) begin 3,7,23,151, i.e. for n = 2, 3, 4, 5. Semiprime values of a(n) begin 4247 = 31 * 137, 1052823 = 3 * 350941, i.e. for n = 6, 7. - Jonathan Vos Post (jvospost3(AT)gmail.com), May 09 2005
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FORMULA
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a(0) = 0, a(n) = a(n-1)+(2^(Fib(n+1)-1))
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CROSSREFS
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A005203, A048722, A036571.
Sequence in context: A133788 A120271 A145938 this_sequence A113824 A121883 A060235
Adjacent sequences: A048718 A048719 A048720 this_sequence A048722 A048723 A048724
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KEYWORD
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nonn
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AUTHOR
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Antti Karttunen, 30.3.1999
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