30451

Appears in sequences

• Denominators of continued fraction convergents to sqrt(636).at n=10A042221
• Indices of primes which remain prime if any one digit is deleted (leading zeros allowed).at n=48A084375
• a(n) is the earliest number m such that n*pi(m)=phi(m).at n=8A097651
• Indices of primes in sequence defined by A(0) = 37, A(n) = 10*A(n-1) - 3 for n > 0.at n=12A101840
• 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, 0), (0, 0, -1), (1, 1, 0)}.at n=9A149324
• n^3 + 4*n^2 - 5*n + 1.at n=30A241577
• Start with a single hexagon; at n-th generation add a hexagon at each expandable vertex (this is the "vertex to side" version); a(n) is the sum of all label values at n-th generation. (See comment for construction rules.)at n=19A247905
• Capped binary boundary codes for holeless strictly non-overlapping polyhexes (all orientations and rotations included).at n=29A258002
• Capped binary boundary codes for fusenes (all orientations and rotations included).at n=29A258012
• G.f. A(x) satisfies: A( x - A(x^3)/x ) = x.at n=10A272460
• Numbers m such that Stern polynomial B(m,x) has no irreducible polynomial factors that themselves are Stern polynomials. The initial a(1) = 1 is included by convention.at n=43A389918