Timeline for Can you answer my son's fourth-grade homework question: Which numbers are prime, have digits adding to ten and have a three in the tens place?

Current License: CC BY-SA 3.0

13 events

when toggle format	what		by	license	comment
Oct 19, 2016 at 20:12	comment	added	tuskiomi		The ending digit (in the 'ones' place) could be `1` as well, so long as the other digit was a `5`.
Sep 4, 2013 at 16:31	review	Suggested edits
Sep 4, 2013 at 16:33
Sep 20, 2011 at 17:27	comment	added	JSchlather		@JDH I've added both.
Sep 20, 2011 at 17:24	history	edited	JSchlather	CC BY-SA 3.0	Edit: Added scripts
S Sep 20, 2011 at 14:56	history	suggested	CommunityBot	CC BY-SA 3.0	numbers as list
Sep 20, 2011 at 14:55	review	Suggested edits
S Sep 20, 2011 at 14:56
Sep 20, 2011 at 14:48	comment	added	JDH		Would it be possible for you to post your scripts?
Sep 20, 2011 at 6:47	history	edited	JSchlather	CC BY-SA 3.0	Made some revision in light of a few errors.
Sep 20, 2011 at 6:36	comment	added	JSchlather		@Dr jimbob You're right somewhere around writing the first program that condition slipped my mind and I was just looking at digits summing to ten. I'll revise my program and take some new data.
Sep 20, 2011 at 5:40	comment	added	dr jimbob		Aren't all your answers above (in the edit numbers like `100000030000000000000030000000000000000000000003`), having the 3 in the "ones" places not the "tens" place as required in the teacher's problem? I agree with the arguments that they appear to be many (and likely infinite per Michael's argument)? Shouldn't you just check for numbers in the forms $10^n + 310^m + 33$ or $310^n + 310^m + 31$ or $10^n+510^m+31$ or $610^n + 31$, $410^n + 33$, etc.
Sep 20, 2011 at 4:31	history	edited	JSchlather	CC BY-SA 3.0	added new data
Sep 20, 2011 at 4:06	comment	added	JDH		Thanks very much! ...and I am sure that Horatio will be interested to report these additional cases to his teacher! :-)
Sep 20, 2011 at 4:03	history	answered	JSchlather	CC BY-SA 3.0