Smallest semiprime with Hamming weight n (i.e., smallest semiprime with exactly n ones when written in binary), or -1 if no such number exists.

A102029

Smallest semiprime with Hamming weight n (i.e., smallest semiprime with exactly n ones when written in binary), or -1 if no such number exists.

Terms

    a(0) =4a(1) =6a(2) =14a(3) =15a(4) =55a(5) =95a(6) =247a(7) =447a(8) =511a(9) =1535a(10) =2047a(11) =7167a(12) =12287a(13) =32255a(14) =49151a(15) =98303a(16) =196607a(17) =393215a(18) =983039a(19) =1572863a(20) =3145727a(21) =6291455a(22) =8388607a(23) =33423359a(24) =50331647a(25) =117440511a(26) =201326591a(27) =528482303a(28) =805306367a(29) =1879048191

External references