193906

Appears in sequences

• Trajectory of 3 under map n->45n+1 if n odd, n->n/2 if n even.at n=10A037120
• Indices of primes in sequence defined by A(0) = 41, A(n) = 10*A(n-1) + 81 for n > 0.at n=20A101738
• Number of connected regular simple graphs on n vertices with girth exactly 4.at n=17A186744