Revision as of 10:02, 17 September 2023 (view source) Querfeld (talk \| contribs) No edit summary ← Older edit		Revision as of 14:02, 24 September 2023 (view source) Querfeld (talk \| contribs) No edit summary Newer edit →
Line 1: Since the repunit ends in 1 5 can not be a factor of n--[[User:Nigel Galloway\|Nigel Galloway]] ([[User talk:Nigel Galloway\|talk]]) 11:44, 12 February 2022 (UTC) Since the repunit is odd, 2 cannot be a factor of n. And because the digit sum of the repunit is <var>n - 1</var>, 3 cannot be a factor of <var>n~~. --[[User:Querfeld\|Querfeld]]~~</var> (~~[[User~~an ~~talk:Querfeld\|talk]])~~integer ~~10:01~~is divisible by 3, 17if ~~September~~its ~~2023~~digit ~~(UTC~~sum is divisible by 3, but <var>n - 1</var> and <var>n</var> cannot both be divisible by 3).<br> All non-primes below 7<sup>2</sup> are divisible by 2, 3, or 5. So it is sufficient to start the search at 49. --[[User:Querfeld\|Querfeld]] ([[User talk:Querfeld\|talk]]) 14:01, 24 September 2023 (UTC)

Talk:Deceptive numbers: Difference between revisions

Talk:Deceptive numbers (view source)