Nice brain teaser

[math_04]

1,8,15,22,29,36,...............

49,343,2401,.............

77,74,71,68,65,.............

What do all these sequences have in common?

[Rogerio]

The digit 1
:smile:

[DaveC426913]

Well, they're all simple sequences...

n=(n-1)+7
n=(n-1)x7
n=(n-1)-3

[davee123]

- All of the numbers in the sequences are integers.
- If you concatenate the digits of the sequences, each one has the digits "201".
- Each sequence's odd-numbered entries are odd.
- If you concatenate the digits of each sequence, and add the 25th through 35th digits, you'll get the same total, 42.

DaveE

[neu]

The number 7?

[DaveC426913]

sigh.

Commas, ellipses and integers.

Asked & answered.

math_04: we've given answers that have met the criteria. Either grant us a win or tell us there's a better answer than the ones we've provided.

[dawnzky05]

I guess its the number seven and the digits being integers. Am I getting the right answer to the teasers?





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[DaveC426913]

I don't see what 7 has to do with the third sequence.