Search: id:A001836
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%I A001836 M5429 N2359
%S A001836 53,83,158,263,293,368,578,683,743,788,878,893,908,998,1073,1103,1208,
%T A001836 1238,1268,1403,1418,1502,1523,1658,1733,1838,1943,1964,2048,2063,
%U A001836 2153,2228,2243,2258,2363,2393,2423,2468,2558,2573,2633,2657,2678
%N A001836 Numbers n such that phi(2n-1) < phi(2n), where phi is Euler's totient 
               function A000010.
%D A001836 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001836 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001836 V. L. Klee, Jr., Some remarks on Euler's totient function, Amer. Math. 
               Monthly, 54 (1947), 332.
%D A001836 J. O. Shallit, personal communication.
%H A001836 T. D. Noe, <a href="b001836.txt">Table of n, a(n) for n=1..1000</a>
%H A001836 Don Reble, <a href="a001836.py.txt">Python program</a>
%Y A001836 Cf. A000010.
%Y A001836 Sequence in context: A059245 A125876 A136065 this_sequence A144939 A118149 
               A119289
%Y A001836 Adjacent sequences: A001833 A001834 A001835 this_sequence A001837 A001838 
               A001839
%K A001836 nonn,nice
%O A001836 1,1
%A A001836 N. J. A. Sloane (njas(AT)research.att.com).
%E A001836 Corrected and extended by Don Reble (djr(AT)nk.ca), Jan 04 2007

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