Excess of n + product of digits over next prime associated with A091628.

Terms

a(0) =0a(1) =8a(2) =10a(3) =42a(4) =72a(5) =176a(6) =354a(7) =764a(8) =1516a(9) =3022a(10) =6066a(11) =12268a(12) =24570a(13) =49148a(14) =98246a(15) =196530a(16) =393158a(17) =786406a(18) =1572834a(19) =3145674a(20) =6291440a(21) =12582874a(22) =25165764a(23) =50331634a(24) =100663192a(25) =201326576a(26) =402653180a(27) =805306350a(28) =1610612690a(29) =3221225038