34447

Appears in sequences

• Hexagonal pyramidal numbers, or greengrocer's numbers.at n=37A002412
• Numbers k such that 10*3^k - 1 is prime.at n=45A005542
• Odd hexagonal pyramidal numbers.at n=18A015225
• a(n) = 49*(n-1)*(n-2)/2.at n=36A027469
• Composite numbers not divisible by 2 or 3 which in base 3 contain their largest proper factor as a substring.at n=28A063132
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.at n=8A149787
• a(n) = binomial(n+1,2)*7^2.at n=37A162942
• Number of partitions of n containing at least one part m-10 if m is the largest part.at n=37A212550
• Let S be the binary string consisting of the first n digits of (100101)*; a(n) = number of ways of writing S as a product of palindromes.at n=27A215255
• The number of vertically fault-free domino tilings of the 5 X (2n) board.at n=6A232621
• a(n) = A266196(A000079(n)); indices of powers of 2 in A266195.at n=36A266186
• E.g.f. satisfies A(x) = exp( x*A(x) / (1 - x^3*A(x)^3) ).at n=6A376563
• E.g.f. satisfies A(x) = exp( x*A(x) * (1 + x^3*A(x)^3) ).at n=6A376565