26243

Appears in sequences

• a(n) = (4*n+1)*(4*n+3).at n=40A001539
• Quasi-Carmichael numbers to base 3: squarefree composites n such that prime p|n ==> p-3|n-3.at n=10A029560
• Numbers having four 8's in base 9.at n=3A043488
• Matrix 7th power of partition triangle A008284.at n=46A050301
• Number of alpha-beta evaluations in a tree of depth n and branching factor b=3.at n=17A060647
• a(n) = n*9^n - 1.at n=3A064755
• Nonprime solutions to k == -1 (mod phi(k+1)).at n=42A067930
• Numbers k that have no zero digits and such that both k+1 and (product of digits of k) + 1 are squares.at n=18A081990
• Triangular array T of numbers generated by these rules: 1 is in T; and if x is in T, then 2x+1 and 3x+2 are in T.at n=53A094615
• Clique number of commuting graph of symmetric group S_n.at n=28A135908
• Clique number of commuting graph of alternating group A_n.at n=28A135909
• a(n) = 36n^2 - 1.at n=26A136017
• a(n) = n-th derivative of Sec(Exp(z)-1) at z=0.at n=8A139134
• Numbers of the form i*9^j-1 (i=1..8, j >= 0).at n=35A140576
• a(n) = prime(2*n^2) - 2*n^2.at n=39A141086
• a(n) = 729*n - 1.at n=35A158395
• a(n) = 4*3^n-1.at n=8A171498
• Number of n X 4 binary arrays with every 1 having exactly one king-move neighbor equal to 1.at n=6A183437
• Number of nX7 binary arrays with every 1 having exactly one king-move neighbor equal to 1.at n=3A183440
• T(n,k)=Number of nXk binary arrays with every 1 having exactly one king-move neighbor equal to 1.at n=48A183442