19802

Appears in sequences

• a(0) = 1, a(n) = 22*n^2 + 2 for n>0.at n=30A010012
• Let x(n) = 123...n, y(n) = n...321; c(n) = delete the LSD of y(n) and concatenated with x(n); d(n) = delete LSD of x(n) and concatenate with y(n). a(n) = c(n) - d(n).at n=2A083828
• Numbers n such that if p=prime(n), then p, p+6, p+12, p+18 are consecutive primes with p=6*k+5 for some k, where prime(n) denotes n-th prime.at n=32A090835
• Number of products of distinct factorials not exceeding n!.at n=38A101977
• Semiprimes of the form 2*(m^2 + m + 1) (implying that m^2 + m + 1 is a prime).at n=31A107317
• Expansion of (x^2-2*x)/(x^4-x^2+2*x-1).at n=21A108014
• Numbers k which when sandwiched between two 2's give a multiple of k.at n=13A116437
• Numbers k which when sandwiched between two 4's give a multiple of k.at n=19A116439
• Numbers k which when sandwiched between two 6's give a multiple of k.at n=25A116441
• Numbers k which when sandwiched between two 8's give a multiple of k.at n=23A116443
• Row sums of triangle A125653, in which column k equals the eigensequence of the matrix power A125653^k.at n=10A125658
• A triangular sequence of coefficients of the expansion of a Green's function for the radial Morse potential with x being the kinetic energy and t being the radius: Hamiltonian; H=K+V=x+Exp[-2*t]-2*Exp[t];G*Exp[t*x)=Exp[x*t]/(t-H); p(t,x)=Exp[t*x]/(t-x-Exp[-2*t] + 2*Exp[-t]).at n=36A138160
• a(n) = Lucas(n) - floor(Lucas(n)/2).at n=22A173495
• Eigensequence for the Moebius mu triangle A152904.at n=27A185694
• Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.at n=4A200449
• T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.at n=25A200454
• Number of -n..n arrays x(0..6) of 7 elements with zero sum and nonzero first and second differences.at n=2A200459
• Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths starting at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 9, n >= 2.at n=37A214042
• Expansion of (1-x+x^3)/(1-x^2+2*x^3-x^4).at n=22A226447
• a(0)=0, a(1)=1; a(n) = n*a(n-1) + (n-2)*a(n-2) - Sum_{j=1..n-1} a(j)*a(n-j).at n=9A259870