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Search: id:A071964
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| A071964 |
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Numbers n such that n = Lpf(n)*Lpf(phi(n)) where Lpf(x) = A006530(x) is the largest prime factor of x. |
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+0
1
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| 4, 6, 9, 10, 21, 25, 34, 39, 49, 55, 57, 111, 121, 155, 169, 203, 205, 219, 253, 289, 291, 301, 305, 327, 361, 489, 497, 505, 514, 529, 579, 689, 737, 755, 791, 841, 889, 905, 961, 979, 1027, 1081, 1205, 1255, 1299, 1355, 1369, 1379, 1461, 1477, 1681, 1703
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI) for(n=1, 3000, if(vecmax(component(factor(n), 1))*vecmax(component(factor(eulerphi(n)), 1))==n, print1(n, ", ")))
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CROSSREFS
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Sequence in context: A077554 A118778 A108635 this_sequence A135257 A118697 A118695
Adjacent sequences: A071961 A071962 A071963 this_sequence A071965 A071966 A071967
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 16 2002
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