# A001153 (b-file synthesized from sequence entry) 1 2 2 3 3 5 4 7 5 17 6 31 7 89 8 127 9 521 10 607 11 1279 12 2281 13 3217 14 4423 15 9689 16 19937 17 23209 18 44497 19 110503 20 132049 21 756839 22 859433 23 3021377 24 6972593 25 24036583 26 25964951 27 30402457 28 32582657 29 42643801 30 43112609