34177

Appears in sequences

• The 5x + 1 sequence beginning at 7.at n=41A028389
• Numbers k such that 78*10^k + 217 is prime.at n=17A102278
• Trajectory of 7 under repeated application of the map in A185452.at n=25A185455
• Composite numbers and 1 which yield a prime whenever a 7 is inserted anywhere in them, including at the beginning or end.at n=41A216168
• Composite numbers k such that sigma(k + sigma(k)) = 2*sigma(k).at n=33A246858
• Expansion of 1/((1+x)*(1+3*x)*(1-4*x)).at n=8A249998
• 5x + 1 sequence beginning at 11.at n=45A259193
• Number of (undirected) paths in the n-gear graph.at n=12A292000
• Number of nX4 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero.at n=13A303715
• Inverse Weigh transform of (-1)^n * n!.at n=7A306153
• Numbers m such that sigma(m) = tau(m)! where sigma(k) = A000203(k) and tau(k) = A000005(k).at n=26A351866
• Main diagonal of A365991: the n-th term in the trajectory of n under the A185452 map.at n=22A368301
• Main diagonal of A365991: the n-th term in the trajectory of n under the A185452 map.at n=27A368301
• Triangle read by rows: numerators of the almost-Riordan array ( 3*(7 - 4*x + sqrt(1 - 8*x))/(24 - 48*x + 16*x^2 + (3*x - 3)*(1 - 4*x - sqrt(1 - 8*x))) | 24/(24 - 48*x + 16*x^2 + (3*x - 3)*(1 - 4*x - sqrt(1 - 8*x))), (1 - 4*x - sqrt(1 - 8*x))/(8*x) ).at n=31A389706