19488

Appears in sequences

• Dowling numbers: e.g.f. exp(x + (exp(b*x)-1)/b) with b=8.at n=5A003580
• Number of extended Skolem sequences of order n.at n=8A004077
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 69.at n=37A031567
• Number of 3 X 3 matrices with elements from [0,...,(n-1)] satisfying the condition that the middle element of each row or column is the difference of the two end elements (in absolute value).at n=13A058333
• Numbers k such that sigma(x) = k has exactly 10 solutions.at n=29A060666
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,9.at n=21A064241
• Numbers m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,61.at n=1A065698
• a(n) = phi(n^3 + n^2 + n + 1).at n=41A066792
• Composite numbers k such that phi(k) divides sigma(k) - 2*k.at n=21A068412
• a(n) = prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1.at n=19A141133
• a(n) = n*(n+1)*(5*n + 4)/6.at n=28A162147
• Numbers of the form p^5*q*r*s where p, q, r, and s are distinct primes.at n=20A179704
• Number of binary strings of length n with no substrings equal to 00000 or 00100.at n=15A188765
• Binomial transform of A212831(n).at n=12A218009
• a(n) = (n^2 + 2*(Sum_{j = 1..n} j^n)) (mod n^3).at n=31A219540
• Number of (n+3)X5 0..1 arrays with every row and column least squares fitting to a positive slope straight line.at n=2A222781
• Number of (n+3)X6 0..1 arrays with every row and column least squares fitting to a positive slope straight line.at n=1A222782
• T(n,k)=Number of (n+3)X(k+3) 0..1 arrays with every row and column least squares fitting to a positive slope straight line.at n=7A222784
• T(n,k)=Number of (n+3)X(k+3) 0..1 arrays with every row and column least squares fitting to a positive slope straight line.at n=8A222784
• Sum of the divisors of n^3 - 1.at n=19A234860