note
Anonymous Monk
a couple of general formulas such as the the fangs
<p>
x = 25.10^k+1
y = 100(10^(k+1)+52)/25
<p>
give the vampire
<p>
v = xy = (10^(k+1)+52)10^(k+2)+100(10^k+1+52)/25
= x'.10^(k+2)+t
<br> = 8(26+5.10^k)(1+25.10^k)
<p>
where x' denotes x with digits reversed
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