The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A064260 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A064260

Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,47.
(history; published version)

#12 by OEIS Server at Thu Oct 17 05:58:33 EDT 2019

LINKS

Amiram Eldar, <a href="/A064260/b064260_1.txt">Table of n, a(n) for n = 1..10000</a>

#11 by Giovanni Resta at Thu Oct 17 05:58:33 EDT 2019

STATUS

reviewed

approved

Discussion

Thu Oct 17

05:58

OEIS Server: Installed new b-file as b064260.txt.  Old b-file is now b064260_1.txt.

#10 by Michel Marcus at Thu Oct 17 05:43:25 EDT 2019

STATUS

proposed

reviewed

#9 by Amiram Eldar at Thu Oct 17 05:38:16 EDT 2019

STATUS

editing

proposed

#8 by Amiram Eldar at Thu Oct 17 05:28:42 EDT 2019

LINKS

Amiram Eldar, <a href="/A064260/b064260_1.txt">TITLE FOR LINKTable of n, a(n) for n = 1..10000</a>

#7 by Amiram Eldar at Thu Oct 17 05:28:28 EDT 2019

OFFSET

0,1,1

LINKS

Amiram Eldar, <a href="/A064260/b064260.txt">TITLE FOR LINK</a>

#6 by Amiram Eldar at Thu Oct 17 05:27:01 EDT 2019

NAME

Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number, (A087788), where a,b,c = 1,2,47.

DATA

210, 2466, 4158, 5850, 14028, 116958, 156156, 166026, 176178, 188868, 208608, 225528, 232860, 241320, 252036, 284748, 290106, 290670, 345378, 350736, 399240, 439566, 444078, 448308, 450000, 498786, 582540, 669678, 708030, 722976, 746100, 809268, 813216, 860028

COMMENTS

am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1).

MATHEMATICA

carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 47}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* Amiram Eldar, Oct 17 2019 *)

CROSSREFS

Cf. A087788.

EXTENSIONS

Offset corrected and more terms added by Amiram Eldar, Oct 17 2019

STATUS

approved

editing

#5 by Charles R Greathouse IV at Tue Mar 10 10:24:56 EDT 2015

REFERENCES

Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27, 2001.

Discussion

Tue Mar 10

10:24

OEIS Server: https://oeis.org/edit/global/2371

#4 by Russ Cox at Fri Mar 30 16:49:12 EDT 2012

AUTHOR

_N. J. A. Sloane (njas(AT)research.att.com), _, Sep 23 2001

Discussion

Fri Mar 30

16:49

OEIS Server: https://oeis.org/edit/global/110

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

COMMENTS

am+1, bm+1, cm+1 are primes, and am | (N-1), bm | (N-1), cm |(N-1)

KEYWORD

nonn,new

nonn

AUTHOR

N. J. A. Sloane (njas, (AT)research.att.com), Sep 23 2001