5 (+6) 11 (+5) 16 (+5) 21 (+5) 26
Apart from (+6), there is an increase of 5, as shown in the brackets above.
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composite numbers between 11 and 21:12 14 15 16 18
16 and -5
Your answer is 16 & 21 21 - 16 = 5 21 * 16 = 336
16
21 hundreds + 16 tens +11 units = 2,100+160+11=2271