Sum of exponents in prime-power factorization of p(n)*p(n-1) - 1.

Terms

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