Sphenic numbers that are the product of Mersenne primes.

Terms

a(0) =651a(1) =2667a(2) =11811a(3) =27559a(4) =172011a(5) =761763a(6) =1777447a(7) =2752491a(8) =3120771a(9) =7281799a(10) =11010027a(11) =12189603a(12) =28442407a(13) =32247967a(14) =48758691a(15) =49938051a(16) =113770279a(17) =116522119a(18) =199753347a(19) =466091143a(20) =516026527a(21) =2064117919a(22) =3220807683a(23) =7515217927a(24) =12883304451a(25) =30061043719a(26) =33281679391a(27) =45097156587a(28) =133127479327