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Search: id:A114565
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| A114565 |
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Dropping first and last digit of n leaves its largest prime factor. |
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+0
1
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| 128, 150, 175, 250, 378, 432, 450, 672, 750, 875, 1024, 1197, 1537, 1593, 1675, 2112, 2176, 2596, 3179, 3192, 3478, 3792, 3977, 4050, 4199, 4232, 4895, 5412, 5612, 6171, 6794, 7738, 8294, 8533, 9072, 9196, 9796, 10614, 10731, 11371, 11398
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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Dropping first and last digit of 4199 leaves 19, which is the largest prime factor of 4199=13*17*19.
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MATHEMATICA
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Select[Range[100, 50000], (First@Last@FactorInteger@# == FromDigits@Rest@Most@IntegerDigits@#) &]
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CROSSREFS
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Adjacent sequences: A114562 A114563 A114564 this_sequence A114566 A114567 A114568
Sequence in context: A121374 A097758 A130445 this_sequence A109651 A114408 A114418
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KEYWORD
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base,easy,nonn
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AUTHOR
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Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 15 2006
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