34191

Appears in sequences

• Reverse or triple: if reverse(a(n)) > a(n), a(n+1) = reverse(a(n)), else a(n+1) = 3*a(n).at n=10A042938
• Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.at n=19A073873
• a(1) = 0, then smallest triangular number such that a(n+1)- a(n) is a palindrome.at n=23A075057
• Triangular numbers for which the sum of the digits is a heptagonal number.at n=31A117312
• Hexagonal numbers with prime indices.at n=31A117961
• Triple and reverse digits.at n=6A163632
• Triangular numbers T such that both (T+2) and (T-2) are semiprimes.at n=37A242356
• a(n) = (n + 1)*(4*n^2 + 14*n + 9)/3.at n=28A268484
• Triangular numbers that in base 2 have the same number of 0's and 1's.at n=16A345348
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^6/(1 + x*A(x)^2).at n=6A378920