22564

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 84 ones.at n=23A031852
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=24A131523
• Where records occur in A047160.at n=28A155765
• L.g.f.: Sum_{n>=1} (x^n/n) / Product_{d|n} (1 - d*x^n).at n=21A198299
• Number of n X n 0..2 symmetric matrices with every element equal to zero, one or three horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order.at n=4A210901
• Smallest Riesel number to base n.at n=43A273987
• a(n) is obtained by applying the map k -> composite(k) n times, starting at n.at n=34A280327
• a(1) = 50 and for any n > 0, a(n+1)^2 is the smallest square that begins with a(n).at n=33A309123
• Numbers k such that the concatenation in increasing order of their prime factors, with multiplicity, is congruent to 1 (mod k).at n=7A349705
• Numbers that are a proper substring of the concatenation (with repetition) in increasing order of their prime factors.at n=1A378893
• Composite numbers k such that k is a substring of A067599(k).at n=10A390475