Note that format xxx has no effect on the precision of calculation. It only affects display.
peta to nano (x-ray)
Compress strings (not springs)
Mysterious digits operation (easy)
Sums of Multiple Pairs of Triangular Numbers
Two fractions, one sum
Pandigital Multiples of 11 (based on Project Euler 491)
Numbers in extended form
Singularity v5 (with apologies to the true hack masters)
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