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Search: id:A055197
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| 10, 14, 16, 19, 20, 21, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 54, 56, 57, 58, 64, 65, 66, 67, 70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 81, 82, 84, 85, 87, 88, 89, 90, 91, 92, 94, 95, 96, 98, 99, 100
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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From a question posed by Leo Moser.
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REFERENCES
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Martin Gardner, "The Last Recreations," Chapter entitled "Strong Laws of Small Primes," Copernicus, Springer-Verlag, NY 1997, page 199.
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MATHEMATICA
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s=1; Do[ s=s+EulerPhi[ n ]; If[ !PrimeQ[ s ], Print[ n ] ], {n, 1, 100} ]
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CROSSREFS
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Cf. A005728.
Adjacent sequences: A055194 A055195 A055196 this_sequence A055198 A055199 A055200
Sequence in context: A162708 A067188 A092632 this_sequence A116610 A096851 A121893
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 04 2000
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