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A058888
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Number of terms in the set invphi(2*p(n)), where p(n) is the n-th prime.
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6
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4, 4, 2, 0, 2, 0, 0, 0, 2, 2, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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EXAMPLE
| The set invphi(2*3)={7,9,14,18}. It has 4 terms, so a(2)=4, while invphi(2*1601)={3203,6406}, thus a(252)=2.
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MAPLE
| with(numtheory): [seq(nops(invphi(2*ithprime(i))), i=1..256)];
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CROSSREFS
| A000010, A005277, A007617, A002202.
Sequence in context: A120396 A141024 A173210 * A194678 A153015 A173635
Adjacent sequences: A058885 A058886 A058887 * A058889 A058890 A058891
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jan 08 2001
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