26741

Appears in sequences

• Number of paraffins (see Losanitsch reference for precise definition).at n=20A006010
• Number of cyclically symmetric plane partitions in the n-cube; also number of 2n X 2n half-turn symmetric alternating sign matrices divided by number of n X n alternating sign matrices.at n=6A006366
• a(n) = (n+1)^2*(n+2)*(n+3)*(3*n+4)/24.at n=10A108650
• Numbers k such that between k and the next prime there are gpf(k) numbers, where gpf(k) denotes the largest prime factor of k.at n=22A235425
• The sum of the numbers of the central diamond of the multiplication table [1..k] X [1..k] for k=2*n-1.at n=10A357042
• 4-brilliant numbers: numbers which are the product of four primes having the same number of decimal digits.at n=41A376704
• a(n) is the number of positive integers k for which Sum_{i=1..r} p_i = Sum_{i=1..r} e_i = n, where p_1^e_1*...*p_r^e_r is the canonical prime factorization of k.at n=34A390784