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Search: id:A065026
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| A065026 |
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a(1) = 1; for n>1, a(n) = smallest number which is not a sum or product of any subset of the numbers a(1) to a(n-1). |
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+0
3
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| 1, 2, 4, 9, 17, 25, 59, 67, 176, 226, 578, 628, 1340, 1876, 4472, 5728, 13952, 17704, 43112, 54568, 133088, 168496, 410720, 519856, 1267568, 1604560, 3911840, 4951552, 12072512, 15281632, 37257248, 47160352, 114980864, 145544128
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(4) = 9 because the possible sums and products of one or more terms from a(1), a(2), a(3) are 1, 2, 4, 1+2, 1+4, 2+4, 1+2+4, 1, 2, 4, 1*2, 1*4, 2*4, 1*2*4 = 1, 2, 4, 3, 5, 6, 7, 1, 2, 4, 2, 4, 8, 8. The smallest missing number is 9.
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CROSSREFS
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Adjacent sequences: A065023 A065024 A065025 this_sequence A065027 A065028 A065029
Sequence in context: A063981 A131095 A136379 this_sequence A007502 A088039 A115451
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KEYWORD
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nonn,nice
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AUTHOR
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Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Nov 02 2001
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EXTENSIONS
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More terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jun 17 2007
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