a(n) is the first composite number having the same base-n digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).

A278981

a(n) is the first composite number having the same base-n digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).

Terms

    a(0) =15a(1) =399a(2) =85a(3) =318a(4) =57a(5) =906a(6) =85a(7) =1670a(8) =1111a(9) =18193a(10) =185a(11) =7205205a(12) =4119a(13) =63791a(14) =4369a(15) =1548502a(16) =489a(17) =258099a(18) =451a(19) =408166a(20) =13315a(21) =1012985a(22) =679a(23) =25841526a(24) =26533a(25) =2884373a(26) =985a(27) =49101338a(28) =1057a(29) =5362755

External references