a(0) = 4 because 5^0 + 3 = 4 = A001358(1) and no semiprime is closer to 5^0.
a(1) = 4 because 5^1  1 = 4 = A001358(1) and no semiprime is closer to 5^1.
a(2) = 25 because 5^2 + 0 = 25 = A001358(9), no semiprime is closer to 5^2.
a(3) = 123 because 5^3  2 = 123 = 3 * 41 = A001358(42), no semiprime is closer.
a(4) = 626 because 5^4 + 1 = 626 = 2 * 313, no semiprime is closer.
a(5) = 3127 because 5^5 + 2 = 3127 = 53 * 59, no semiprime is closer.
a(6) = 15623 because 5^6  2 = 15623 = 17 * 919, no semiprime is closer.
a(7) = 78123 because 5^7  2 = 78123 = 3 * 26041, no semiprime is closer.
a(8) = 390623 because 5^8  2 = 390623 = 73 * 5351, no semiprime is closer.
a(9) = 1953122 because 5^9  3 = 1953122 = 2 * 976561, no semiprime is closer.
a(10) = 9765627 because 5^10 + 2 = 9765627 = 3 * 3255209, no semiprime closer.
