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Search: id:A063668
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| A063668 |
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Numbers of form 12s+2 with nonempty inverse totient set. |
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+0
2
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| 110, 506, 2162, 3422, 4970, 6806, 11342, 17030, 27722, 31862, 36290, 51302, 56882, 62750, 68906, 96410, 120062, 128522, 146306, 175142, 185330, 195806, 217622, 228962, 240590, 252506, 316406, 343982, 358202, 417962, 433622, 465806, 516242
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OFFSET
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1,1
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COMMENT
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Each of these sets contains 2 terms. Other 12j+2 numbers have empty InvPhi-Set.
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FORMULA
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Phi[(12m-1)^2], where 12m-1=q prime.
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EXAMPLE
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For a(49)=1407782=12*117315+2, invphi(1407782)={1408969,2817938}={1187^2,2*1187^2}, where 1187=12*99-1, is a prime of 12m-1 form. For such p primes: {{11,23,47,59,..}, Phi[p^2] generates this sequence.
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CROSSREFS
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Cf. A000010, A002202.
Sequence in context: A120727 A134213 A028995 this_sequence A074240 A008450 A035836
Adjacent sequences: A063665 A063666 A063667 this_sequence A063669 A063670 A063671
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 22 2001
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