20175

Appears in sequences

• T(n, 2n-9), T given by A027926.at n=11A027932
• a(n) = T(2n,n+3), T given by A027948.at n=5A027951
• a(n) = greatest number in row n of array T given by A027948.at n=16A027957
• Greatest number in row n of array T given by A027926.at n=16A027988
• Partial sums of A053295.at n=9A053296
• Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives j values.at n=5A053677
• a(n) = 3^n + 5^n + 7^n.at n=5A074552
• Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both semiprime.at n=33A085774
• Antidiagonal sums of A086272 (and of A086273).at n=24A086274
• Indices of primes in sequence defined by A(0) = 19, A(n) = 10*A(n-1) - 31 for n > 0.at n=23A102021
• Sum of fifth powers of three consecutive primes.at n=1A133532
• Sum of fifth powers of n odd primes.at n=2A133550
• Expansion of g.f. (1/2)*( a*(1+x)^n + b*(1-x)^(n+2)*LerchPhi(x, -n-1, 1) + c*2^(n+1)*(1-x)^(n+1)*LerchPhi(x, -n, 1/2) ), where a = -1, b = 1, and c = 1, read by rows.at n=46A168517
• Expansion of g.f. (1/2)*( a*(1+x)^n + b*(1-x)^(n+2)*LerchPhi(x, -n-1, 1) + c*2^(n+1)*(1-x)^(n+1)*LerchPhi(x, -n, 1/2) ), where a = -1, b = 1, and c = 1, read by rows.at n=53A168517
• Number of 0..n arrays x(0..3) of 4 elements without any interior element greater than both neighbors.at n=13A200887
• G.f.: A(x) = Sum_{n>=0} x^(n*(n+1)/2) / Product_{k=1..n} (1-x^k)^(n-k+1).at n=23A206139
• a(n) = 4*a(n-1) - 3*a(n-2) - a(n-3), with a(0)=0, a(1)=0 and a(2)=1.at n=11A215404
• O.g.f. satisfies: A(x) = Sum_{n>=0} 3*(n+3)^(n-1) * (n*x)^n * A(n*x)^n/n! * exp(-(n+3)*n*x*A(n*x)).at n=4A219345
• Number of partitions of n such that m(greatest part) >= m(1), where m = multiplicity.at n=43A240080
• Numbers divisible by prime(d) for each digit d in their base-6 representation, none of which may be zero.at n=33A256876