Mersenne

result.txt

Try 13466917

real	4m14.519s
user	4m14.412s
sys	0m0.072s

Try 20996011

real	8m33.265s
user	8m31.852s
sys	0m0.116s

Try 24036583

real	11m25.705s
user	11m24.252s
sys	0m0.236s

Try 25964951

real	12m9.261s
user	12m6.116s
sys	0m0.296s

Try 30402457

real	16m5.024s
user	15m53.396s
sys	0m0.336s

Try 32582657

real	17m29.473s
user	17m26.460s
sys	0m0.304s

Try 37156667

real	21m12.535s
user	21m7.708s
sys	0m0.340s

Try 42643801

real	26m34.814s
user	26m32.048s
sys	0m0.268s

Try 43112609

real	27m8.524s
user	27m8.188s
sys	0m0.152s

Try 57885161

real	42m11.639s
user	42m10.672s
sys	0m0.264s

Try 74207281

real	61m0.614s
user	60m59.116s
sys	0m0.284s

Try 77232917

real	67m12.919s
user	67m10.504s
sys	0m0.360s

t.sh

#!/bin/bash

LIST="
13466917
20996011
24036583
25964951
30402457
32582657
37156667
42643801
43112609
57885161
74207281
77232917
"

for n in $LIST; do
	echo -e "\nTry $n"
	time echo "2^$n-1" | bc > /dev/null
done