This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
222 is in the sequence because 222 = 2*3*37, product of 3 distinct primes.
with(numtheory):
for n from 1 to 23 do:
for b from 1 to 9 do:
x:=(((10^n)- 1)/9)*b:y:=factorset(x):n1:=nops(y):
if bigomega(x)=3 and n1=3
then
printf(`%d, `,x):
else
fi:
od:
od:
Select[Flatten@ Map[Map[Function[k, FromDigits@ Table[k, {#}]], Range[1, 9]] &, Range@ 20], Length@ # == 3 && Times @@ Last /@ # == 1 &@ FactorInteger@ # &] (* Michael De Vlieger, Feb 07 2016 *)
a(20) = 74 = 2 * 37 = (22)_36 is semiprime and Brazilian. 25 = 5 * 5 is semiprime and no Brazilian, and 45 = (55)_8 = (33)_14 = 3^2 * 5 is Brazilian but no semiprime.
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