1555555

Appears in sequences

• Expansion of g.f. (1+4*x)/((1-x)*(1-10*x)).at n=6A099915
• Smallest semiprime containing exactly n 5's.at n=5A104724
• Smallest semiprime ending in exactly n 5's.at n=5A106659
• Conversion to octal of the binary expansion given by the first n terms of the period-3 sequence A011655 (repeat 0, 1, 1).at n=19A289006
• Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order.at n=34A372280