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 Mar1 revised Finite Automaton that accepts only the words baa,ab, abb and no other strings longer or shorter fixed grammar Mar1 suggested approved edit on Finite Automaton that accepts only the words baa,ab, abb and no other strings longer or shorter Nov22 comment How to explain that division by $0$ yields infinity to a 2nd grader @HagenvonEitzen with this reasoning what would have you said the first time someone said i² = -1 ? ERROR like the stup** windows calc ? Jul27 comment How to detect when continued fractions period terminates That's what Gerry Myerson answered but it only applies to square roots, sorry ! Jul27 answered How to detect when continued fractions period terminates Jul5 awarded Student Jul5 awarded Scholar Jul5 accepted Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Jul5 comment Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Now it becomes easy as pie :) thank you ! Jul5 awarded Editor Jul5 revised Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Just added a \cdot line 3 Jul5 asked Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Nov9 awarded Supporter