69921

Appears in sequences

• Quotients k*(k+1)*(k+2) / (k+(k+1)+(k+2)) that are lucky numbers.at n=32A032792
• Numbers whose set of base-16 digits is {1,2}.at n=32A032936
• Numbers whose base-4 representation has exactly 9 runs.at n=9A043600
• Numbers n such that number of runs in the base 4 representation of n is congruent to 1 mod 8.at n=33A043851
• Numbers n such that number of runs in the base 4 representation of n is congruent to 0 mod 9.at n=9A043858
• Numbers k such that number of runs in the base 4 representation of k is congruent to 9 mod 10.at n=9A043876
• For n > 1, a(n) is the smallest number such that n-th concatenation is prime and the smallest palindrome beginning with (but not equal to) this concatenation is also prime.at n=32A088090
• Egyptian fraction representation for the cube root of 73.at n=2A132547
• p*(p+2)/3 where p and p+4 are primes.at n=23A181093
• Pseudoprimes to base 8 that are not squarefree.at n=17A243090
• Pseudoprimes to base 10 that are not squarefree.at n=11A306449
• Number of squares and rectangles in the interior of the square with vertices (n,0), (0,n), (-n,0) and (0,-n) in a square (x,y)-grid.at n=17A330805