1 3 10 12 14 21 ◇
Identify ◇
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3$\begingroup$ possibly in OEIS: 16- oeis.org/A283770 11 - oeis.org/A004515 $\endgroup$ – Kryesec Nov 28 '18 at 6:27
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1$\begingroup$ one more number added $\endgroup$ – black doggy Nov 28 '18 at 7:53
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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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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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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.
answered Nov 28 '18 at 8:03
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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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