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A069875
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Smallest multiple of n with a prime signature different from all previous terms.
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0
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1, 2, 6, 4, 20, 24, 42, 8, 36, 60, 176, 72, 312, 210, 180, 16, 544, 144, 912, 320, 420, 792, 2208, 216, 800, 1560, 243, 896, 4176, 900, 5580, 64, 2112, 3570, 1680, 432, 7992, 4864, 3744, 1600, 14760, 2688, 18060, 4752, 1800, 11040, 24064, 864, 6272, 3600
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| a(1) through a(4) have prime signatures 0, 1, (1, 1) and 2. a(5) = 20 because 5 has prime signature 1, which has already been used and 10 and 15 have prime signature (1, 1), which has already been used, but 20 has prime signature (2, 1), which has not yet been used.
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CROSSREFS
| Sequence in context: A079579 A112326 A075435 * A202962 A019088 A096085
Adjacent sequences: A069872 A069873 A069874 * A069876 A069877 A069878
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 25 2002
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Apr 30 2003
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