40
40 = 2 * 2 * 2 * 5
\( 40^7 = 1^7+3^7+5^7+9^7+12^7+14^7+16^7+17^7+18^7+20^7+21^7+22^7+25^7+28^7+39^7 \)
240 - 1 = 3 * 5 * 5 * 11 * 17 * 31 * 41 * 61681
1040 - 1 = 3 * 3 * 11 * 41 * 73 * 101 * 137 * 271 * 3541 * 9091 * 27961 * 1676321 * 5964848081
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