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Revision History for A086806

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A086806

Sarrus numbers k such that k-1 and k+1 have the same number of prime divisors (counted with multiplicity).
(history; published version)

#15 by Michel Marcus at Sat Jun 29 02:25:16 EDT 2019

STATUS

reviewed

approved

#14 by Joerg Arndt at Sat Jun 29 01:47:04 EDT 2019

STATUS

proposed

reviewed

#13 by Michel Marcus at Fri Jun 28 17:29:42 EDT 2019

STATUS

editing

proposed

Discussion

Fri Jun 28

17:41

Amiram Eldar: Yes.

#12 by Michel Marcus at Fri Jun 28 17:29:25 EDT 2019

CROSSREFS

Intersection of A001222 A001567 and A280382.

Cf. A001567A001222.

Discussion

Fri Jun 28

17:29

Michel Marcus: ok ?

#11 by Michel Marcus at Fri Jun 28 17:29:01 EDT 2019

CROSSREFS

Intersection of A001222 and A280382.

Cf. A001222, A001567.

STATUS

proposed

editing

#10 by Amiram Eldar at Fri Jun 28 15:33:35 EDT 2019

STATUS

editing

proposed

#9 by Amiram Eldar at Fri Jun 28 15:33:25 EDT 2019

LINKS

Amiram Eldar, <a href="/A086806/b086806.txt">Table of n, a(n) for n = 1..10000</a>

#8 by Amiram Eldar at Fri Jun 28 15:32:59 EDT 2019

NAME

Sarrus numbers n k such that nk-1 and nk+1 have the same number of prime divisors (counted with multiplicity).

OFFSET

0,1,1

STATUS

approved

editing

#7 by N. J. A. Sloane at Fri Dec 15 17:36:33 EST 2017

AUTHOR

_Jason Earls (zevi_35711(AT)yahoo.com), _, Aug 05 2003

Discussion

Fri Dec 15

17:36

OEIS Server: https://oeis.org/edit/global/2722

#6 by N. J. A. Sloane at Sat Oct 17 07:48:37 EDT 2015

EXAMPLE

341 is a pseudo-prime pseudoprime to base 2 while 340 = 2^2*5*17 and 342 = 2*3^2*19 each have four primes dividing them.

Discussion

Sat Oct 17

07:48

OEIS Server: https://oeis.org/edit/global/2468