Seven numbers

Write seven 4-digit numbers that are divisible by 3 and at the same time by 4.

Correct result:

a1 =  1008
a2 =  1020
a3 =  1032
a4 =  1044
a5 =  1056
a6 =  1068
a7 =  1080

Solution:

3 ... primenumber 4=22 LCM(3,4)=22⋅3=12  d=LCM(3,4)=12 b=1000/d=1000/12=2503≐83.3333 b1=⌈b⌉=⌈83.3333⌉=84  a1=b1⋅ d=84⋅ 12=1008
a2=a1+d=1008+12=1020
a3=a2+d=1020+12=1032
a4=a3+d=1032+12=1044
a5=a4+d=1044+12=1056
a6=a5+d=1056+12=1068
a7=a6+d=1068+12=1080

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