174766

Appears in sequences

• Expansion of (1+4x+x^2-10x^3)/((1-x)(1-x-2x^2)).at n=16A093380
• a(0)=1, a(n)= 2+2^n/6+4*(-1)^n/3, n>0.at n=20A173197
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 841", based on the 5-celled von Neumann neighborhood.at n=18A284246
• a(n) = A324542(2*prime(n)).at n=16A324552
• Irregular triangle, read by rows, where row n lists composite numbers c such that c * sigma_n(c) == 2 (mod phi(c)) for n >= 0. Row lengths for n=0,1,... are given in A392307.at n=65A392306