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#12 by Harvey P. Dale at Sat Mar 21 14:57:20 EDT 2020
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#11 by Harvey P. Dale at Sat Mar 21 14:57:17 EDT 2020
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Harvey P. Dale, <a href="/A049454/b049454.txt">Table of n, a(n) for n = 0..1000</a>
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approved
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#10 by Harvey P. Dale at Sat Mar 21 14:56:08 EDT 2020
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#9 by Harvey P. Dale at Sat Mar 21 14:56:05 EDT 2020
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Table[1+Sum[EulerPhi[i]^2, {i, n}], {n, 0, 50}] (* Harvey P. Dale, Mar 21 2020 *)
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approved
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#8 by Joerg Arndt at Sat Mar 07 01:16:22 EST 2020
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#7 by Michel Marcus at Sat Mar 07 00:59:55 EST 2020
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#6 by Michel Marcus at Sat Mar 07 00:59:47 EST 2020
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(PARI) a(n) = 1 + sum(i=1, n, eulerphi(i)^2); \\ Michel Marcus, Mar 07 2020
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Cf. A000010 (phi), A005728.
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proposed
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#5 by Jon E. Schoenfield at Sat Mar 07 00:15:01 EST 2020
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#4 by Jon E. Schoenfield at Sat Mar 07 00:14:58 EST 2020
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a(n) = 1+ + Sum_{i=1..n} phi(i)^2.
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_N. J. A. Sloane_._
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#3 by Russ Cox at Fri Mar 30 16:48:32 EDT 2012
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_N. J. A. Sloane (njas(AT)research.att.com)._.
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Discussion
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| Fri Mar 30
| 16:48
| OEIS Server: https://oeis.org/edit/global/110
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