Number of primes occurring exactly once as numerators in sums generated from the set 1, 1/2, 1/3,..., 1/n.

A217712

Number of primes occurring exactly once as numerators in sums generated from the set 1, 1/2, 1/3,..., 1/n.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =3a(4) =11a(5) =13a(6) =27a(7) =54a(8) =106a(9) =168a(10) =378a(11) =142a(12) =733a(13) =1597a(14) =1283a(15) =3418a(16) =8204a(17) =10112a(18) =24644a(19) =7829a(20) =32866a(21) =78136a(22) =178741a(23) =37002a(24) =256392a(25) =650596a(26) =1402914a(27) =286854a(28) =2053463

External references