18598

Appears in sequences

• Number of triangular regions in regular n-gon with all diagonals drawn.at n=31A062361
• Numbers k such that the Reverse and Add! trajectory of k (presumably) does not reach a palindrome (with the exception of k itself) and does not join the trajectory of any term m < k.at n=40A088753
• Number of A095312-primes in range ]2^n,2^(n+1)].at n=20A095332
• Terms in A112039 that are divisible by 3, divided by 3.at n=28A112040
• Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P.at n=42A225385
• Number of (n+1)X(2+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.at n=11A233403
• Numbers k such that the Reverse and Add! trajectory of k (presumably) does not reach a palindrome and does not join the trajectory or one of the reverse numbers of the trajectory of any term m < k.at n=39A306232