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Search: id:A001836
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| A001836 |
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Numbers n such that phi(2n-1) < phi(2n), where phi is Eler's totient function A000010.
(Formerly M5429 N2359)
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+0
1
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| 53, 83, 158, 263, 293, 368, 578, 683, 743, 788, 878, 893, 908, 998, 1073, 1103, 1208, 1238, 1268, 1403, 1418, 1502, 1523, 1658, 1733, 1838, 1943, 1964, 2048, 2063, 2153, 2228, 2243, 2258, 2363, 2393, 2423, 2468, 2558, 2573, 2633, 2657, 2678
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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V. L. Klee, Jr., Some remarks on Euler's totient function, Amer. Math. Monthly, 54 (1947), 332.
J. O. Shallit, personal communication.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
Don Reble, Python program
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CROSSREFS
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Cf. A000010.
Sequence in context: A059245 A125876 A136065 this_sequence A118149 A119289 A124282
Adjacent sequences: A001833 A001834 A001835 this_sequence A001837 A001838 A001839
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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Corrected and extended by Don Reble (djr(AT)nk.ca), Jan 04 2007
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