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Search: id:A037171
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A037171 Numbers n such that phi(n) = number of primes <= n (i.e. A000010[ n ]=A000720[ n ]). +0
11
2, 3, 4, 8, 10, 14, 20, 90 (list; graph; listen)
OFFSET

1,1

REFERENCES

D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 11.

EXAMPLE

phi(10)=4, pi(10)=4.

CROSSREFS

Cf. A037228.

Adjacent sequences: A037168 A037169 A037170 this_sequence A037172 A037173 A037174

Sequence in context: A051783 A033083 A005542 this_sequence A127352 A114854 A127279

KEYWORD

easy,nonn,fini,full

AUTHOR

Naohiro Nomoto (6284968128(AT)geocities.co.jp)

EXTENSIONS

David W. Wilson (davidwwilson(AT)comcast.net) and Jeffrey Shallit showed that 90 is the last term.

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.


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