Primes p such that sigma(p+3) = sigma(p-3).

Terms

a(0) =23a(1) =653a(2) =947a(3) =2027a(4) =4133a(5) =5431a(6) =18433a(7) =30089a(8) =39733a(9) =61667a(10) =71233a(11) =120947a(12) =148439a(13) =163673a(14) =238801a(15) =265813a(16) =493853a(17) =502499a(18) =1070033a(19) =1100921a(20) =1139141a(21) =1176127a(22) =1207447a(23) =1364401a(24) =1959961a(25) =1979281a(26) =2164471a(27) =3156319a(28) =3175967a(29) =3195233