a(n) is the least number that can be written in exactly n ways as p*q + q*r + p*r where (p,q,r) is an unordered triple of distinct primes.

A356457

a(n) is the least number that can be written in exactly n ways as p*q + q*r + p*r where (p,q,r) is an unordered triple of distinct primes.

Terms

    a(0) =1a(1) =31a(2) =71a(3) =151a(4) =191a(5) =491a(6) =671a(7) =887a(8) =311a(9) =1151a(10) =1391a(11) =1751a(12) =1031a(13) =2711a(14) =2831a(15) =3911a(16) =1991a(17) =3191a(18) =5351a(19) =9551a(20) =7031a(21) =20951a(22) =8951a(23) =8711a(24) =10631a(25) =5591a(26) =15431a(27) =10391a(28) =15791a(29) =28031

External references