1713599

Properties

Appears in sequences

• Primes which produce records in A157188, at index i=pi(a(n)) (pi=A000720).at n=14A157190
• Lesser of twin primes p >= 3 for which sigma(p+1)/sigma(p-1) reaches record value, where sigma(n) is the divisor sum function (A000203).at n=6A326391
• Lesser of twin primes p for which sigma(p+1)/sigma(p) reaches record value, where sigma(n) is the divisor sum function (A000203).at n=18A326392
• Lesser of twin primes p such that d(p+1) > d(q+1) for all lessers of twin primes q < p, where d(n) is the number of divisors of n (A000005).at n=26A328329
• a(n) is the least prime p such that there are exactly n pairs of primes (q,r) with p > q > r such that q | r + p and r | q + p.at n=23A344776
• a(n) is the least number that occurs exactly n times in A075255.at n=21A385964
• Prime numbersat n=129076