Number Puzzle

[Donut]

Can anyone help me with this.

What is the missing number in this sequence and why?

1,7,11,27,?,107

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Save Chip - Don't let Sarah win!
Official Titterer of the Laughing Hyenas
Don't mention the score - I mentioned it once but I think I got away with it!

the missing number is 51, the sequence is (x2)+5 and (x2)-3 for alternate numbers

thus

(1 x 2) + 5 = 7
(7 x 2) - 3 = 11
(11 x 2) + 5 = 27
(27 x 2) - 3 = 51
(51 x 2) + 5 = 107



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Holy Avenger of the OHF and part time Pinguindiebjäger

[Donut]

Originally posted by Sir_Tainly: the missing number is 51, the sequence is (x2)+5 and (x2)-3 for alternate numbers thus (1 x 2) + 5 = 7 (7 x 2) - 3 = 11 (11 x 2) + 5 = 27 (27 x 2) - 3 = 51 (51 x 2) + 5 = 107

Very good SirT. I'm usually good at these but this one had me stumped. I was looking at Base 8, base 9, base 12, periodic table and roman numerals.



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Save Chip - Don't let Sarah win!
Official Titterer of the Laughing Hyenas
Don't mention the score - I mentioned it once but I think I got away with it!

[Donut]

Originally posted by Sir_Tainly: the missing number is 51, the sequence is (x2)+5 and (x2)-3 for alternate numbers thus (1 x 2) + 5 = 7 (7 x 2) - 3 = 11 (11 x 2) + 5 = 27 (27 x 2) - 3 = 51 (51 x 2) + 5 = 107

Now I've been told that's not the answer she's looking for. Bummer

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Save Chip - Don't let Sarah win!
Official Titterer of the Laughing Hyenas
Don't mention the score - I mentioned it once but I think I got away with it!

Originally posted by Donut: Now I've been told that's not the answer she's looking for. Bummer

What does she want blood????

Ok I'll think of another answer

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Holy Avenger of the OHF and part time Pinguindiebjäger

What was the answer in the end Donut?

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Holy Avenger of the OHF and part time Pinguindiebjäger

[Avatar]

Remember series are deceptive. There can be a huge number of potential answers.
Although this one gives the previous and after number, there still leaves many possibilities....

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[Donut]

Originally posted by Sir_Tainly: What was the answer in the end Donut?

I was sure I posted the answer yesterday. It must have got lost somewhere.

It's to do with the number of syllables in numbers.

One - 1
seven - 2
eleven - 3
twenty seven - 4
seventy seven - 5
one hundred and seven - 6

I told her that I thought your answer was far more elegant.

No I didn't, I didn't even tell her that it was your answer. I took all of the credit myself. Well, I have to impress her somehow.

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Save Chip - Don't let Sarah win!
Official Titterer of the Laughing Hyenas
Don't mention the score - I mentioned it once but I think I got away with it!

[This message has been edited by Donut (edited 09-13-2001).]

[Avatar]

Originally posted by Sir_Tainly: the missing number is 51, the sequence is (x2)+5 and (x2)-3 for alternate numbers thus (1 x 2) + 5 = 7 (7 x 2) - 3 = 11 (11 x 2) + 5 = 27 (27 x 2) - 3 = 51 (51 x 2) + 5 = 107

Yep same as adding 6 then 4, then 16 then 14, then 66, then 64
Not very good, but not different to Sir_Tainly!!

[Kaz]

Originally posted by Donut: I was sure I posted the answer yesterday. It must have got lost somewhere. It's to do with the number of syllables in numbers. One - 1 seven - 2 eleven - 3 twenty seven - 4 seventy seven - 5 one hundred and seven - 6

That is cheap. You could take two hundred and seven for 6 syllables or one hundred and five for 5 syllables. Sir Tainly's is a lot more elegant.