Greatest exponent in prime-power factorization of prime(n)*prime(n-1) - 1.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =2a(7) =1a(8) =2a(9) =2a(10) =1a(11) =1a(12) =2a(13) =1a(14) =2a(15) =1a(16) =1a(17) =1a(18) =2a(19) =2a(20) =1a(21) =2a(22) =2a(23) =1a(24) =3a(25) =2a(26) =1a(27) =2a(28) =3a(29) =2