20792

Appears in sequences

• n*10^2-1, n*10^2-3, n*10^2-7 and n*10^2-9 are all prime.at n=27A064976
• Even elements of A082931.at n=44A082933
• Number of increasing mobiles (cycle rooted trees) with n generators.at n=5A108528
• Number of nX2 1..3 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.at n=16A166776
• Number of n element 1..n arrays with each element the minimum of 7 adjacent elements of a permutation of 1..n+6 of n+6 elements.at n=7A217890
• Expansion of r(q^4) / r(q)^4 in powers of q where r() is the Rogers-Ramanujan continued fraction.at n=37A285584
• Sum of piles of first n primes: a(n) = Sum(prime(i)*(2*i-1): 1<=i<=n).at n=20A316322
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=12A317261
• Number of integer partitions of n whose parts have weakly decreasing numbers of prime factors (A001222).at n=41A358909