219453
domain: N
Appears in sequences
- Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.at n=18A068898
- Triangular numbers T such that T+10 is the next prime after T.at n=30A129540
- Smallest triangular number with exactly n anagrams that are triangular numbers.at n=5A166596
- a(n) = larger member of n-th pair of distinct, positive, triangular numbers whose sum and difference are also triangular numbers.at n=13A185128
- Triangular numbers whose binary conversion, read in decimal, is prime.at n=18A227028
- Triangular numbers which have one or more occurrences of exactly six different digits.at n=30A241789
- G.f. A(x) satisfies A(x) = 1 + x*A(x)/A(-x*A(x)).at n=15A384951