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