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Search: id:A101301
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| A101301 |
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a(n) = Sum_{x=1..n} phi(prime(x)) . |
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+0
1
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| 1, 3, 7, 13, 23, 35, 51, 69, 91, 119, 149, 185, 225, 267, 313, 365, 423, 483, 549, 619, 691, 769, 851, 939, 1035, 1135, 1237, 1343, 1451, 1563, 1689, 1819, 1955, 2093, 2241, 2391, 2547, 2709, 2875, 3047, 3225, 3405, 3595, 3787, 3983, 4181, 4391, 4613, 4839
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Sum of first n primes minus n. [Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 23 2009]
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FORMULA
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a(n)=A007504(n)-A000027(n). [Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 23 2009]
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MAPLE
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seq((sum(phi(ithprime(x)), x=1..a)), a=1..100);
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CROSSREFS
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Cf. A000010, A000040.
Adjacent sequences: A101298 A101299 A101300 this_sequence A101302 A101303 A101304
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KEYWORD
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nonn,new
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AUTHOR
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Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Dec 22 2004
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