Values of the first prefixing digits for Mersenne primes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =10a(6) =1a(7) =36a(8) =15a(9) =58a(10) =57a(11) =55a(12) =310a(13) =177a(14) =51a(15) =2389a(16) =973a(17) =532a(18) =1750a(19) =63a(20) =1032a(21) =1240a(22) =3757a(23) =9994a(24) =5854a(25) =12870a(26) =46147a(27) =11923a(28) =17113a(29) =10296