303810

Appears in sequences

• Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n*(n+1)*(n-1)*(n-2)/8.at n=40A050534
• Triangular numbers that remain triangular when the least significant digit is moved to the beginning.at n=15A068071
• a(n) = rad(n*(n+1)*(n+2)*(n+3)).at n=37A078638
• Hexagonal numbers for which both the sum of the digits and the product of the digits are also hexagonal numbers.at n=32A117064
• Triangular numbers that are the product of two triangular numbers greater than 1.at n=37A188630
• Triangular numbers that can be represented as a sum of two distinct triangular numbers, and as a product of two triangular numbers greater than 1.at n=17A295768
• Hexagonal numbers (A000384) in which parity of digits alternates.at n=28A297645
• a(n) is the smallest triangular number T(k) such that both it and its successor T(k+1) have exactly 2n divisors, or 0 if no such pair of consecutive triangular numbers exists.at n=31A319036
• Smallest integer > 0 so that its remainders modulo the first n primes are less than half their respective moduli.at n=18A327408
• Smallest integer > 0 so that its remainders modulo the first n primes are less than half their respective moduli.at n=19A327408
• 32*a(n) is the denominator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3.at n=37A351697
• a(n) is the least n-gonal number that is the product of n distinct primes, or 0 if there are none.at n=4A359854
• Triangular numbers which are products of six distinct primes.at n=3A362758
• Consider primitive pairs of integers (b, c) with b < 0 such that x^5 + b*x + c = 0 is irreducible and solvable by radicals: sequence gives values of c.at n=11A371558