Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).
A326393
Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).
Terms
- a(0) =2a(1) =3a(2) =5a(3) =11a(4) =23a(5) =47a(6) =59a(7) =167a(8) =179a(9) =239a(10) =359a(11) =719a(12) =839a(13) =1259a(14) =3359a(15) =5039a(16) =10079a(17) =35279a(18) =37799a(19) =55439a(20) =110879a(21) =166319a(22) =665279a(23) =831599a(24) =1081079a(25) =1441439a(26) =6320159a(27) =6486479a(28) =12972959a(29) =24504479
External references
- oeis: A326393