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Search: id:A077552
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| A077552 |
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Consider the following triangle in which the n-th row contains n distinct numbers whose product is the smallest and has the least possible number of divisors. 1 is a member of only the first row. Sequence contains the final term of the rows (the leading diagonal). |
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4
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| 1, 3, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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For n>2, a(n)=2^n. - Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 21 2003
Row sums of triangle A132309. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 18 2007
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EXAMPLE
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Triangle begins
1
2 3
2 4 8
2 4 8 16
2 4 8 16 32
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CROSSREFS
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Cf. A132309.
Sequence in context: A081661 A005103 A001978 this_sequence A024623 A027291 A048952
Adjacent sequences: A077549 A077550 A077551 this_sequence A077553 A077554 A077555
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 10 2002
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EXTENSIONS
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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 21 2003
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