35511

Appears in sequences

• Triangular numbers with sum of digits = 15.at n=37A068130
• Triangular numbers which are a concatenation of two or more positive triangular numbers.at n=34A068144
• Triangle of numbers {a(n,k), n >= 0, 0<=k<=n} defined by a(0,0)=1, a(n,0)=A006013(n), a(n+1,n)=A001764(n+1), a(n,m) = Sum A001764(n-k)*a(n,k), k=0..m.at n=34A073148
• Triangular numbers with only odd digits.at n=22A117960
• Triangular numbers composed of digits {1,3,5}.at n=8A119113
• Triangular numbers T such that T+10 is the next prime after T.at n=9A129540
• Triangular numbers t such that t+10 is a prime.at n=34A129755
• Principal diagonal of the convolution array A213831.at n=20A213832
• Principal diagonal of the convolution array A213844.at n=18A213845
• Triangular numbers n such that sigma(n) is a square number.at n=10A256151
• Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).at n=22A292064
• Fibonacci sequence beginning 2, 21.at n=17A294116
• a(n) is the total number of down-steps after the final up-step in all 2-Dyck paths of length 3*n (n up-steps and 2*n down-steps).at n=7A334680