The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A084200

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A084200

LeastCommonMultiple{q+1: q prime, q < prime(n), q+1 divides prime(n)+1}.
(history; published version)

#10 by OEIS Server at Wed Aug 14 08:33:48 EDT 2024

LINKS

Matthew House, <a href="/A084200/b084200_1.txt">Table of n, a(n) for n = 1..10000</a>

#9 by Michael De Vlieger at Wed Aug 14 08:33:48 EDT 2024

STATUS

reviewed

approved

Discussion

Wed Aug 14

08:33

OEIS Server: Installed first b-file as b084200.txt.

#8 by Joerg Arndt at Wed Aug 14 03:10:03 EDT 2024

STATUS

proposed

reviewed

#7 by Michael S. Branicky at Tue Aug 13 17:18:22 EDT 2024

STATUS

editing

proposed

#6 by Michael S. Branicky at Tue Aug 13 17:17:47 EDT 2024

PROG

(Python)

from math import lcm

from sympy import sieve

def a(n):

pn = sieve[n]

return lcm(*[q+1 for q in sieve.primerange(2, pn) if (pn+1)%(q+1)==0])

print([a(n) for n in range(1, 100)]) # Michael S. Branicky, Aug 13 2024

STATUS

proposed

editing

Discussion

Tue Aug 13

17:18

Michael S. Branicky: program matches corrected data and entire new b-file.

#5 by Matthew House at Tue Aug 13 01:05:30 EDT 2024

STATUS

editing

proposed

#4 by Matthew House at Tue Aug 13 01:05:11 EDT 2024

NAME

LeastCommonMultiple{q+1: q prime, q < prime(n), q+1 divides prime(n)+1}.

DATA

1, 1, 3, 4, 12, 1, 6, 4, 24, 6, 8, 1, 42, 4, 24, 18, 60, 1, 4, 72, 1, 40, 84, 90, 14, 6, 8, 108, 1, 114, 3, 2, 32, 132, 6, 140, 30, 152, 1, 4, 168, 6, 180, 14, 96, 1, 18, 40, 4, 224, 228, 1, 18, 240, 1, 252, 6, 264, 270, 13, 6, 136, 1, 6, 4, 294, 308, 312, 1, 6, 4, 1, 348, 14, 6, 360, 8, 1

LINKS

Matthew House, <a href="/A084200/b084200_1.txt">Table of n, a(n) for n = 1..10000</a>

EXTENSIONS

Definition and terms corrected by Matthew House, Aug 13 2024

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:50:35 EDT 2012

AUTHOR

_Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), _, May 18 2003

Discussion

Fri Mar 30

18:50

OEIS Server: https://oeis.org/edit/global/246

#2 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystemsgmail.com), May 18 2003

#1 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003

NAME

LeastCommonMultiple{q+1: q prime, q+1 divides prime(n)+1}.

DATA

1, 1, 3, 4, 12, 1, 6, 4, 24, 6, 8, 1, 42, 4, 24, 18, 60, 1, 4, 72, 1, 40, 84, 90, 14, 6, 8, 108, 1, 114, 3, 2, 132, 6, 140, 30, 152, 1, 4, 168, 6, 180, 14, 96, 1, 18, 40, 4, 224, 228, 1, 18, 240, 1, 252, 6, 264, 270, 13, 6, 1, 6, 4, 294, 308, 312, 1, 6, 4, 1, 348, 14, 6, 360, 8, 1

OFFSET

1,3

CROSSREFS

Cf. A084196, A082539, A084197.

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), May 18 2003

STATUS

approved