A307507 Brazilian semiprimes.

10, 14, 15, 21, 22, 26, 33, 34, 35, 38, 39, 46, 51, 55, 57, 58, 62, 65, 69, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 177, 178, 183, 185, 187, 194, 201, 202, 203, 205, 206, 209, 213, 214, 215, 217, 218

Offset: 1

Author

Bernard Schott, Apr 11 2019

Keywords

• nonn
• base

Comments

Comparison with A001358 (semiprimes): in this sequence, there are no squared primes apart from 121 = (11111)_3, and also 6 is missing from here since it is not Brazilian.

Different from the squarefree semiprimes of A006881: this sequence = {A006881 \ 6} Union {121}.

Examples

			a(20) = 74 = 2 * 37 = (22)_36 is semiprime and Brazilian.
25 = 5 * 5 is semiprime and no Brazilian, and 45 = (55)_8 = (33)_14 = 3^2 * 5 is Brazilian but no semiprime.
		

Crossrefs

Intersection of A001358 and A125134.

Cf. A006881, A190300, A196104.