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A002174 Values taken by reduced totient function psi(n).
(Formerly M0986 N0370)
8
1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 22, 24, 28, 30, 32, 36, 40, 42, 44, 46, 48, 52, 54, 56, 58, 60, 64, 66, 70, 72, 78, 80, 82, 84, 88, 90, 92, 96, 100, 102, 104, 106, 108, 110, 112, 116, 120, 126, 128, 130, 132, 136, 138, 140, 144, 148, 150, 156, 160, 162, 164, 166, 168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

If p is a Sophie Germain prime (A005384), then 2p is here. - T. D. Noe, Aug 13 2008

Terms of A002322, sorted and multiple values taken just once. - Vladimir Joseph Stephan Orlovsky, Jul 21 2009

REFERENCES

D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, pp. 7-10.

C. Moreau, Sur quelques theoremes d'arithmetique, Nouvelles Annales de Mathématiques, 17 (1898), 293-307.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

T. D. Noe, Table of n, a(n) for n = 1..10000

Florian Luca and Carl Pomerance, On the range of Carmichael's universal-exponent function, Acta Arithmetica 162 (2014), pp.289-308.

C. Moreau, Sur quelques théorèmes d'arithmétique, Nouvelles Annales de Mathématiques, 17 (1898), 293-307.

FORMULA

n (log n)^0.086 << a(n) << n (log n)^0.36 where << is the Vinogradov symbol, see Luca & Pomerance. - Charles R Greathouse IV, Dec 28 2013

MATHEMATICA

lst={}; Do[AppendTo[lst, CarmichaelLambda[n]], {n, 6*7!}]; lst; Take[Union[lst], 123] (* Vladimir Joseph Stephan Orlovsky, Jul 21 2009 *)

(* warning: there seems to be no guarantee that terms near end are omitted! - Joerg Arndt, Dec 23 2014 *)

CROSSREFS

Cf. A002322, A002396, A143407, A143408.

Sequence in context: A011860 A259278 A049445 * A002202 A049225 A076450

Adjacent sequences:  A002171 A002172 A002173 * A002175 A002176 A002177

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from T. D. Noe, Aug 13 2008

STATUS

approved

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Last modified February 8 22:22 EST 2016. Contains 268099 sequences.