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Search: id:A137152
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| A137152 |
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Triangle read by rows: prime powers whose row products give A051451. |
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+0
3
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| 1, 1, 2, 1, 2, 3, 1, 1, 3, 4, 1, 1, 3, 4, 5, 1, 1, 3, 4, 5, 7, 1, 1, 3, 1, 5, 7, 8, 1, 1, 1, 1, 5, 7, 8, 9, 1, 1, 1, 1, 5, 7, 8, 9, 11, 1, 1, 1, 1, 5, 7, 8, 9, 11, 13, 1, 1, 1, 1, 5, 7, 1, 9, 11, 13, 16, 1, 1, 1, 1, 5, 7, 1, 9, 11, 13, 16, 17, 1, 1, 1, 1, 5, 7, 1, 9, 11, 13, 16, 17, 19, 1, 1, 1, 1, 5, 7, 1
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Similar to tables A133232 and A133233.
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EXAMPLE
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The least common multiple of the first few rows are:
lcm{1} = 1
lcm{1,2} = 2
lcm{1,2,3} = 6
lcm{1,1,3,4} = 12
lcm{1,1,3,4,5} = 60
lcm{1,1,3,4,5,7} = 420
lcm{1,1,3,1,5,7,8} = 840
lcm{1,1,1,1,5,7,8,9} = 2520
lcm{1,1,1,1,5,7,8,9,11} = 27720
Multiplying the terms in the rows produces the same result:
1 = 1
1*2 = 2
1*2*3 = 6
1*1*3*4 = 12
1*1*3*4*5 = 60
1*1*3*4*5*7 = 420
1*1*3*1*5*7*8 = 840
1*1*1*1*5*7*8*9 = 2520
1*1*1*1*5*7*8*9*11 = 27720
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CROSSREFS
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Cf. A051451.
Adjacent sequences: A137149 A137150 A137151 this_sequence A137153 A137154 A137155
Sequence in context: A133674 A098666 A133232 this_sequence A109004 A103823 A136642
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KEYWORD
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nonn,tabl
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AUTHOR
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Mats Granvik (mgranvik(AT)abo.fi), Jan 24 2008
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