The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A217723

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A217723

a(n) = (sum of first n primorial numbers) minus 1.
(history; published version)

#36 by Harvey P. Dale at Sat May 23 13:30:46 EDT 2020

STATUS

editing

approved

#35 by Harvey P. Dale at Sat May 23 13:30:44 EDT 2020

MATHEMATICA

Accumulate[Table[Fold[Times, Prime[Range[n]]], {n, 20}]]-1 (* Harvey P. Dale, May 23 2020 *)

STATUS

approved

editing

#34 by OEIS Server at Fri Apr 21 20:37:47 EDT 2017

LINKS

Paul Larm (terms 1..20) and Amiram Eldar (terms 21..100), <a href="/A217723/b217723_1.txt">Table of n, a(n) for n = 1..100</a>

#33 by N. J. A. Sloane at Fri Apr 21 20:37:47 EDT 2017

STATUS

proposed

approved

Discussion

Fri Apr 21

20:37

OEIS Server: Installed new b-file as b217723.txt.  Old b-file is now b217723_1.txt.

#32 by Michel Marcus at Fri Apr 21 16:23:23 EDT 2017

STATUS

editing

proposed

#31 by Michel Marcus at Fri Apr 21 16:23:15 EDT 2017

FORMULA

a(1) = P(1)# - 1, a(2) = P(1)# + P(2)# -1; where P(n)# is the product of first n prime numbers (primorial#).

CROSSREFS

Equals A060389 - 1. Cf. A223546, A223548.

STATUS

proposed

editing

#30 by Amiram Eldar at Fri Apr 21 16:19:34 EDT 2017

STATUS

editing

proposed

#29 by Amiram Eldar at Fri Apr 21 16:18:37 EDT 2017

LINKS

Paul Larm (terms 1..20) and Amiram Eldar, (terms 21..100), <a href="/A217723/b217723_1.txt">Table of n, a(n) for n = 1..100</a>

#28 by Amiram Eldar at Fri Apr 21 16:14:35 EDT 2017

LINKS

Paul Larm, Amiram Eldar, <a href="/A217723/b217723_1.txt">Table of n, a(n) for n = 1..20100</a>

STATUS

approved

editing

#27 by N. J. A. Sloane at Tue Aug 11 11:24:35 EDT 2015

STATUS

editing

approved