how did we get to 7000 in the sequence above and what is the next number?

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I dunno, Andre. Here's an answer equally confusing:

(10 + 9 + 90 + 91)*35 = 7000

Then of course keep it up (minus 1, multiply, add 1, etc.):

7000 - 1 = 6999 * 7000 = 48,993,000 + 1 = 48,993,001

so: (7000 + 6999 + 48,993,000 + 48,993,001) * 35 = 3,430,000,000

Whaddya think?

There are infinitely many answers, of course, but here is one that makes sense:

Write out the numbers:

ten

nine

ninety

ninety one

seven thousand

If you count the number of letters you find the sequence

3, 4, 6, 9, 13

Their difference increases by 1 every time, so the next number should have 18 letters. Except for the first, the number of syllables increases by 1 every time:

1, 1, 2, 3, 4,

so the next number could have 5 syllables.

If we just use the digits 0 and 9, the next number could be

99000 = ninety nine thousand

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