a(n) = number of k's that make primorial P(n)/A019565(k)+A019565(k) prime, A019565(k)^2<=P(n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =12a(5) =21a(6) =40a(7) =70a(8) =117a(9) =263a(10) =450a(11) =703a(12) =1385a(13) =2423a(14) =5501a(15) =8617a(16) =18249a(17) =29352a(18) =61970a(19) =103568a(20) =209309a(21) =404977a(22) =853279a(23) =1609502a(24) =3008915a(25) =5342983a(26) =10287184a(27) =19087437a(28) =38498011a(29) =78520137