Numbers k such that us(k) = primepi(k), where us(k) is the sum of the aliquot unitary divisors of k (A034460), and primepi(k) is the number of primes <= k (A000720).

A037176

Numbers k such that us(k) = primepi(k), where us(k) is the sum of the aliquot unitary divisors of k (A034460), and primepi(k) is the number of primes <= k (A000720).

Terms

    a(0) =1a(1) =2a(2) =56a(3) =80a(4) =85a(5) =2527a(6) =2569a(7) =2723a(8) =2807a(9) =7864a(10) =7976a(11) =22941a(12) =113488a(13) =174449a(14) =461403a(15) =1302379a(16) =8513821a(17) =14348051a(18) =70110091a(19) =70111621a(20) =70112369a(21) =249046528a(22) =10910880311

External references