Quadruplets: base 10 representation is the juxtaposition of four identical strings.

A074843

Quadruplets: base 10 representation is the juxtaposition of four identical strings.

Terms

    a(0) =1111a(1) =2222a(2) =3333a(3) =4444a(4) =5555a(5) =6666a(6) =7777a(7) =8888a(8) =9999a(9) =10101010a(10) =11111111a(11) =12121212a(12) =13131313a(13) =14141414a(14) =15151515a(15) =16161616a(16) =17171717a(17) =18181818a(18) =19191919a(19) =20202020a(20) =21212121a(21) =22222222a(22) =23232323a(23) =24242424a(24) =25252525

External references