The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A050710 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A050710

Smallest composite that when added to sum of prime factors reaches a prime after n iterations.
(history; published version)

#18 by Giovanni Resta at Wed Oct 16 03:15:30 EDT 2019

STATUS

reviewed

approved

#17 by Joerg Arndt at Wed Oct 16 03:08:32 EDT 2019

STATUS

proposed

reviewed

#16 by Michel Marcus at Wed Oct 16 00:29:38 EDT 2019

STATUS

editing

proposed

#15 by Michel Marcus at Wed Oct 16 00:29:34 EDT 2019

CROSSREFS

Cf. A050703-, A050704, A050705, A050706, A050707, A050708, A050709. See also A050767.

See also A050767.

STATUS

proposed

editing

#14 by Jon E. Schoenfield at Tue Oct 15 22:28:55 EDT 2019

STATUS

editing

proposed

#13 by Jon E. Schoenfield at Tue Oct 15 22:28:52 EDT 2019

EXAMPLE

E.g. n = 2 gives a(2) = 8 -> 8 = 2*2*2 so 8 + (2+2+2) = 14 and composite (iteration 1); 14 = 2*7 so 14 + (2+7) = 23 and already prime after the second iteration.

AUTHOR

Patrick De Geest, Aug 15 1999.

STATUS

approved

editing

#12 by N. J. A. Sloane at Tue Jan 08 09:12:41 EST 2019

EXTENSIONS

More terms from _Michel ten Voorde (seqfan(AT)tenvoorde.org)_

Discussion

Tue Jan 08

09:12

OEIS Server: https://oeis.org/edit/global/2789

#11 by Bruno Berselli at Sun May 26 02:38:43 EDT 2013

STATUS

proposed

approved

#10 by Donovan Johnson at Sun May 26 01:53:44 EDT 2013

STATUS

editing

proposed

#9 by Donovan Johnson at Sun May 26 01:52:40 EDT 2013

LINKS

Donovan Johnson, <a href="/A050710/b050710.txt">Table of n, a(n) for n = 1..200</a>

EXAMPLE

E.g. n = 2 gives a(2) = 8 -> 8 = 2.*2.*2 so 8 + (2+2+2) = 14 and composite (iteration 1); 14 = 2.*7 so 14 + (2+7) = 23 and already prime after the second iteration.

STATUS

approved

editing