551881

Appears in sequences

• Base 3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.at n=12A033139
• Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3.at n=6A037595
• a(n) = n^4 + n^3 + n^2 + n + 1.at n=27A053699
• Numbers of the form (3^{mr}-1)/(3^r-1) for positive integers m, r.at n=33A076270
• Maximal cycle lengths in a certain class of one-dimensional cellular automata.at n=28A085591
• a(0)=1, a(n) = sigma_3(3n).at n=27A092341
• Irregular triangle in which row n has primitive numbers k such that 1/k is in the Cantor set and the fraction 1/k has period n.at n=34A173800
• a(n) = (27^n - 1)/26.at n=5A218730
• Pseudoprimes to base 3 that are not squarefree.at n=11A244065
• Pseudoprimes to base 3 that are not squarefree, including the non-coprime pseudoprimes.at n=12A306452