The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A372638 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A372638

a(n) = (1/6) * Sum_{k=1..n} phi(7*k).
(history; published version)

#17 by Michael De Vlieger at Fri May 10 08:49:47 EDT 2024

STATUS

reviewed

approved

#16 by Vaclav Kotesovec at Fri May 10 06:59:33 EDT 2024

STATUS

proposed

reviewed

#15 by Seiichi Manyama at Fri May 10 06:56:08 EDT 2024

STATUS

editing

proposed

#14 by Seiichi Manyama at Fri May 10 06:55:37 EDT 2024

LINKS

Eric Weisstein's World of Mathematics, <a href="httphttps://mathworld.wolfram.com/TotientFunction.html">Totient Function</a>.

STATUS

proposed

editing

#13 by Seiichi Manyama at Fri May 10 06:55:19 EDT 2024

STATUS

editing

proposed

#12 by Seiichi Manyama at Fri May 10 05:12:04 EDT 2024

CROSSREFS

Partial sums of A359102.

STATUS

approved

editing

#11 by Alois P. Heinz at Wed May 08 09:34:24 EDT 2024

STATUS

proposed

approved

#10 by Amiram Eldar at Wed May 08 09:27:03 EDT 2024

STATUS

editing

proposed

#9 by Amiram Eldar at Wed May 08 09:25:40 EDT 2024

FORMULA

a(n) ~ (49/(16*Pi^2)) * n^2. - Amiram Eldar, May 08 2024

MATHEMATICA

Accumulate[Table[EulerPhi[7*n], {n, 1, 60}]]/6 (* Amiram Eldar, May 08 2024 *)

STATUS

approved

editing

#8 by Michael De Vlieger at Wed May 08 08:51:56 EDT 2024

STATUS

proposed

approved