The Only Remaining Number . . .

For each box, enter the only integer from 1 to 25 that fits the description excluding numbers that have already appeared on the quiz.

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Last updated: November 12, 2024

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		The only number . . .	Number
✓	1	that is equal to itself squared	1
✓	2	whose digits multiply to 10	25
✓	3	that is an odd perfect square	9
✓	4	that is a perfect cube	8
✓	5	with exactly 3 factors	4
✓	6	that is a perfect square	16
✓	7	that is a multiple of 8	24
✓	8	that is prime and greater than 20	23
✓	9	with exactly four letters when spelled out	5 (five)
✓	10	ending in 5	15
✓	11	which is odd and composite	21
✓	12	that is larger than 20	22
✓	13	with the same digit repeating	11
✓	14	that is even and prime	2
✓	15	beginning with 2	20
✓	16	that contains 0	10
✓	17	that is a single-digit composite number	6
✓	18	that is a triangular number _{(e.g. 1, 1 + 2, 1 + 2 + 3)}	3 (1 + 2)
✓	19	that contains 2	12
✓	20	which has exactly 6 factors	18
✓	21	that is composite	14
✓	22	that is a single digit	7
✓	23	which is part of the Fibonacci sequence	13
✓	24	that is a Leyland number _{(i.e. can be written as a^b + b^a with a, b ≠ 1 like 32 = 2⁴ + 4²)}	17 (2³ + 3²)
✓	25	that is an integer	19