Numbers k such that k! - k# + 1 is prime, where k# is the primorial function.

A081712

Numbers k such that k! - k# + 1 is prime, where k# is the primorial function.

Terms

    a(0) =4a(1) =6a(2) =7a(3) =8a(4) =10a(5) =20a(6) =21a(7) =26a(8) =101a(9) =119a(10) =172a(11) =409a(12) =621a(13) =1043a(14) =1204a(15) =1283a(16) =1673a(17) =2003a(18) =4336a(19) =5773a(20) =12913a(21) =13517

External references