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1 3 10 12 14 21 ◇

Identify ◇

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5
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The next number is

23

Reason:

the numbers are base 5, i.e in decimal they are 1,3,5,7,9,11. The next is 13 in decimal, which is 23 in base 5.

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1
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The next number in the sequence is

23

Reason:

Every third number in the sequence is the previous number plus $7$ and all rest are previous number plus $2$.
So the number next in sequence is $21+2=23$.

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0
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What about

23?

Reasoning:

The difference between consecutive numbers in the series is 2-7-2-2-7; the next difference is probably 2. So the answer is 21+2=23.

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  • $\begingroup$ please notify that before one more number added, it's 2-7-2-2 with your reasoning $\endgroup$ – black doggy Nov 28 '18 at 8:09
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After 21 the digit comes after is 23 because after every odd number add 7 and after every even number only 2 number add. on this case when appear number 1 then comes next is 3.

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  • 2
    $\begingroup$ But 1 is an odd number $\endgroup$ – deep thought Nov 28 '18 at 21:49

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