46056

Appears in sequences

• Triangular numbers with sum of digits = 21.at n=30A068131
• Triangular numbers which are 6-almost primes.at n=28A076580
• Triangular numbers with palindromic indices.at n=39A089717
• Smith triangular numbers.at n=12A098840
• Triangular numbers that are sums of two consecutive primes.at n=32A111163
• Triangular numbers for which the sum of the digits is an octagonal number.at n=33A117523
• Cyclops triangular numbers.at n=13A160717
• Triangular numbers that are sums of twin prime pairs.at n=13A165966
• Binomial convolution of the binomial coefficients bin(3n,n) (A005809).at n=5A188911
• Positions of primes within Dana Scott's sequence (A048736).at n=24A192242
• Number of (w,x,y,z) with all terms in {1,...,n} and w<|x-y|+|y-z|.at n=38A212692
• Triangular numbers representable as x*y+x+y such that x and y are triangular numbers, x>=y>0.at n=24A259745
• Triangular numbers representable as x*y+x+y such that x and y are triangular numbers, x>=y>1.at n=19A259746
• Triangular numbers k such that phi(k) is a square number, where phi(k) is the Euler totient function (A000010).at n=10A287473
• The first of three consecutive triangular numbers the sum of which is equal to the sum of three consecutive primes.at n=25A298168
• Triangular numbers that are the sum of two distinct nonzero triangular numbers in exactly two ways.at n=17A350368
• Positive triangular numbers such that the two numbers before it and the two numbers after it are squarefree.at n=36A374503
• Semiperimeter of the unique primitive Pythagorean triple whose inradius is the n-th prime and whose short leg is an odd number.at n=35A382070