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A139703
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The sequence contains the non-squarefree positive integers n such that the largest prime-power dividing n is prime.
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0
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20, 28, 44, 52, 60, 68, 76, 84, 88, 92, 99, 104, 116, 117, 124, 132, 136, 140, 148, 152, 153, 156, 164, 171, 172, 184, 188, 198, 204, 207, 212, 220, 228, 232, 234, 236, 244, 248, 260, 261, 264, 268, 272, 276, 279, 284, 292, 296, 304, 306, 308, 312, 316, 328
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| This sequence consists of the non-squarefree terms of A122144.
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EXAMPLE
| 99 = 3^2 * 11^1. 99 is therefore not squarefree, because it is divisible by 3^2. Also, the largest prime power dividing 99 is 11^1. This is a prime, so 99 is included in the sequence.
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CROSSREFS
| Cf. A122144.
Sequence in context: A141823 A137428 A124318 * A145567 A043109 A045207
Adjacent sequences: A139700 A139701 A139702 * A139704 A139705 A139706
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Jun 13 2008
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jul 01 2009
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