Primes p such that there exists a prime q < p such that sigma(q-1) = sigma(p+1) = p + q.
A385739
Primes p such that there exists a prime q < p such that sigma(q-1) = sigma(p+1) = p + q.
Terms
- a(0) =5563a(1) =203431a(2) =389923a(3) =901423a(4) =5495263a(5) =7418863a(6) =28128367a(7) =188953969a(8) =210627577a(9) =392753209a(10) =402877087a(11) =505757683a(12) =619418689a(13) =2549153611a(14) =2580356851a(15) =3953660383a(16) =5692944349a(17) =6806206831a(18) =6894059071a(19) =7082199673a(20) =10058113363a(21) =11307503629a(22) =12601725943a(23) =12615171649
External references
- oeis: A385739