428

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Number

$428$ (four hundred and twenty-eight) is:

$2^2 \times 107$

The $2$nd integer after $91$ whose square has a decimal representation consisting of the concatenation of $2$ consecutive integers:

$428^2 = 183 \, 184$

The $1$st integer whose square has a decimal representation consisting of the concatenation of $2$ consecutive increasing integers:

$428^2 = 183 \, 184$

Also see

• Previous  ... Next: Numbers whose Squares have Digits which form Consecutive Integers
• Next: Numbers whose Squares have Digits which form Consecutive Increasing Integers

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $183,184$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $183,184$