1062881

Properties

Appears in sequences

• a(0)=1, a(n) = 3*a(n-1) + 2; a(n) = 2*3^n - 1.at n=12A048473
• Number of alpha-beta evaluations in a tree of depth n and branching factor b=3.at n=24A060647
• Numbers of the form 3^m - 1 or 2*3^m - 1; i.e., the union of sequences A048473 and A024023.at n=25A062318
• a(n) is least odd integer not a partial sum of 1, 3, ..., a(n-1).at n=24A062547
• Second generation sequence in which each number is skipped that can be written as sum of distinct previous entries. To make the first generation we start with all natural numbers: this gives the powers of 2 (A000079). For the second generation we start with the natural numbers from which are removed the numbers of the first generation.at n=24A072134
• Sum of terms in periodic part of continued fraction expansion of square root of -1 + 3^n.at n=23A077631
• Sequence of sums of alternating powers of 3.at n=24A079362
• Primes of the form 2*3^k - 1.at n=5A079363
• 2*3^n-(-1)^n.at n=12A081632
• Smallest prime p such that 3^n divides p^2 - 1.at n=10A125609
• Smallest prime p such that 3^n divides p^2 - 1.at n=11A125609
• Smallest odd prime base q such that p^11 divides q^(p-1) - 1, where p = prime(n).at n=1A133861
• Smallest odd prime base q such that p^12 divides q^(p-1) - 1, where p = prime(n).at n=1A133862
• Clique number of commuting graph of symmetric group S_n.at n=38A135908
• Numbers of the form i*9^j-1 (i=1..8, j >= 0).at n=49A140576
• A048473 prefixed by two zeros.at n=14A154992
• Primes of the form 2^i*3^j - 1 with i + j = 13.at n=6A172315
• Primes of the form 2*k^3-1.at n=18A177105
• a(n) = 54n^3 - 1.at n=26A181968
• Primes of the form 2*n^4-1.at n=9A182784