Brain Teasers
Serious Seriesness
Find the number that comes next in the following series:
3, 7, 12, 14, 16, 19, 21, 25, 30, 41, 45, 52, 54, 56, 59, 61, 65, 70, ?
3, 7, 12, 14, 16, 19, 21, 25, 30, 41, 45, 52, 54, 56, 59, 61, 65, 70, ?
Hint
Libri tresAnswer
91 is the next number.The hint is Latin for "three letters". This is the series of Roman Numerals consisting of three symbols.
3 - III
7 - VII
12 - XII
14 - XIV
16 - XVI
19 - XIX
21 - XXI
25 - XXV
30 - XXX
41 - XLI
45 - XLV
52 - LII
54 - LIV
56 - LVI
59 - LIX
61 - LXI
65 - LXV
70 - LXX
91 - XCI
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Comments
Congrats on your first teaser!
Great first teaser! Well done, Snowdog. I wonder if anyone actually gets this without the hint. I'm annoyed at missing the hint - I read it as something like "very free" but if I'd thought Latin I might have solved it!
Thanks for the welcomes! I'm very pleased you enjoyed this.
Great teaser! Same sentiments as dalfamnest regarding the hint.
But would Bytor have gotten it?
Nice stm8r1. That is indeed the origin of my name. Rush fans unite!
I have never understood these number things so this is not a favorite of mine. Don't even know what we are supposed to look for. I think it is a gender thing. Just not my thing!!
Stumped me.
Great teaser! Very clever and I love Roman numerals, but I didn't get the connection. Nice to see a new one and lots of comments! More from you, please!! Thanks for this one!
Yes, I got it without the hint...but had to think s good bit to get it. Very well done.
Fun but difficult teaser; I was stumped even with the hint. I could not get the connection to the roman numerals.
The sequence of differences is 4,5,2,2,3,2,4,5,11,4,7,2,2,3,2,4,5 ...
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Believing the 4 and 5 in the lead are just place holders, I went with the next number of 70+11= 81 to be followed by 81+4=85, then 85+7=92, etc.
Is my math wrong?
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Believing the 4 and 5 in the lead are just place holders, I went with the next number of 70+11= 81 to be followed by 81+4=85, then 85+7=92, etc.
Is my math wrong?
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