Numbers of the form p+q-r = q+r-s where p < q < r < s are consecutive primes.

Terms

a(0) =1a(1) =13a(2) =37a(3) =65a(4) =223a(5) =343a(6) =637a(7) =1087a(8) =1273a(9) =1423a(10) =1445a(11) =1483a(12) =1603a(13) =1687a(14) =1867a(15) =2077a(16) =2135a(17) =2375a(18) =2605a(19) =2683a(20) =2705a(21) =3029a(22) =3523a(23) =3545a(24) =3913a(25) =3997a(26) =4123a(27) =4633a(28) =4783a(29) =4927