Lesser of twin primes p for which sigma(p+1)/sigma(p) reaches record value, where sigma(n) is the divisor sum function (A000203).

A326392

Lesser of twin primes p for which sigma(p+1)/sigma(p) reaches record value, where sigma(n) is the divisor sum function (A000203).

Terms

    a(0) =3a(1) =5a(2) =11a(3) =29a(4) =59a(5) =179a(6) =239a(7) =419a(8) =1319a(9) =3119a(10) =3359a(11) =7559a(12) =21839a(13) =35279a(14) =42839a(15) =55439a(16) =110879a(17) =415799a(18) =1713599a(19) =1867319a(20) =1912679a(21) =1940399a(22) =2489759a(23) =3991679a(24) =6652799a(25) =6846839a(26) =11531519a(27) =28828799a(28) =85765679a(29) =232792559

External references