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Search: id:A101302
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| A101302 |
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Primes of the form Sum_{k=1..n} phi(prime(k))). |
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+0
1
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| 3, 7, 13, 23, 149, 313, 619, 691, 769, 1237, 1451, 4391, 7639, 9787, 11527, 19489, 21943, 27997, 32869, 35449, 36107, 36767, 46817, 49939, 55691, 56543, 59119, 61757, 69127, 70079, 73973, 81047, 83117, 87337, 89491, 91673, 93871, 106537
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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a = {}; s = 0; Do[s = s + EulerPhi[ Prime[n]]; If[ PrimeQ[s], AppendTo[a, s]], {n, 200}]; a (from Robert G. Wilson v Dec 22 2004)
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CROSSREFS
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Sequence in context: A084898 A147380 A146606 this_sequence A102948 A061263 A076276
Adjacent sequences: A101299 A101300 A101301 this_sequence A101303 A101304 A101305
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KEYWORD
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nonn,easy
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AUTHOR
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Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Dec 22 2004
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 22 2004
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