23529

Appears in sequences

• In the '3x+1' problem, these values for the starting value set new records for number of steps to reach 1.at n=29A006877
• a(n) = floor(n*(n+2)*(2*n-1)/8).at n=44A007518
• a(n) = (2*n+1)*(10*n+1).at n=34A033574
• In the '3x+1' problem, these values for the starting value set new records for number of steps to reach 1.at n=23A033958
• a(n) is the decimal concatenation of n and n^2.at n=22A053061
• a(n) = Product_{k|n} (n+1-k).at n=32A056819
• Number of 5-tuples (v1,v2,v3,v4,v5) of nonnegative integers less than n such that v1 <= v4, v1 <= v5, v2 <= v4, v2 <= v5 and v3 <= v4.at n=10A085463
• Number of (3412,1234)-avoiding involutions in S_n.at n=32A085583
• Main diagonal of polygonal lucky array defined in A128511.at n=9A128947
• Alternating sum of the squares of the first n Jacobsthal numbers.at n=9A138238
• Numbers such that the sum of the largest and the smallest prime divisor equals the sum of the other distinct prime divisors.at n=37A199745
• Primitive (squarefree) elements of A199745.at n=18A200145
• Composite squarefree numbers n such that p(i)+9 divides n-9, where p(i) are the prime factors of n.at n=4A225719
• The hyper-Wiener index of the nanostar dendrimer defined pictorially as NS[n] in the M. Mirzargar reference.at n=0A227483
• Squarefree numbers which yield zero when their prime factors are xored together.at n=14A235488
• Concatenation of prime(n) and its square.at n=8A271422
• a(n) = n*(n + 1)*(4*n + 5)/2.at n=22A281381
• Squarefree products of k primes that are symmetrically distributed around their average. Case k = 4.at n=11A294751
• Numbers k such that k and k+1 are the product of exactly four distinct primes.at n=20A318896
• Numbers k such that k and k+1 each have at least 4 distinct prime factors.at n=40A321504