The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A329815 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A329815

Number of distinct terms in the first difference sequence of the reduced residue system of the n-th primorial.
(history; published version)

#54 by Michel Marcus at Wed Aug 05 08:23:24 EDT 2020

STATUS

reviewed

approved

#53 by Joerg Arndt at Wed Aug 05 08:18:51 EDT 2020

STATUS

proposed

reviewed

#52 by Michel Marcus at Wed Aug 05 06:29:26 EDT 2020

STATUS

editing

proposed

#51 by Michel Marcus at Wed Aug 05 06:29:13 EDT 2020

COMMENTS

Distinct Number of distinct terms listed in row n of A331118. - Michael De Vlieger, Jul 11 2020

STATUS

proposed

editing

Discussion

Wed Aug 05

06:29

Michel Marcus: right ?

#50 by Sean A. Irvine at Wed Aug 05 06:25:55 EDT 2020

STATUS

editing

proposed

#49 by Sean A. Irvine at Wed Aug 05 06:25:45 EDT 2020

KEYWORD

nonn,hard,more

STATUS

proposed

editing

#48 by Michael De Vlieger at Sat Jul 11 23:25:33 EDT 2020

STATUS

editing

proposed

#47 by Michael De Vlieger at Sat Jul 11 23:25:16 EDT 2020

COMMENTS

Distinct terms listed in row n of A331118. - Michael De Vlieger, Jul 11 2020

MATHEMATICA

Primorial[n_] := Times @@ Prime[Range[n]]; Table[Length@ Union@ Differences@ Select[Range@ Primorial[n], CoprimeQ[#, Primorial[n]] &], {n, 7}] (* after _Michael De Vlieger_ Jul 15 2017 from A061498 *)

Table[Length@Union@Differences@Select[Range@Primorial[n], CoprimeQ[#, Primorial[n]] &], {n, 7}] (* after Michael De Vlieger Jul 15 2017 from A061498 *)

CROSSREFS

Cf. A061498, A048670, A309497, A286941, A331118.

STATUS

proposed

editing

Discussion

Sat Jul 11

23:25

Michael De Vlieger: Just added spaces and a semicolon in code.

#46 by Omar E. Pol at Sat Jul 11 20:18:13 EDT 2020

STATUS

editing

proposed

Discussion

Sat Jul 11

20:18

Omar E. Pol: Minor edits.

#45 by Omar E. Pol at Sat Jul 11 20:18:02 EDT 2020

EXTENSIONS

More terms a(12)-a(44) from Jamie Morken, Jul 11 2020 (after Mario Ziller)

STATUS

proposed

editing