52326

Appears in sequences

• 1 / min{1/n - 1/a - 1/b > 0}, where a and b are integers.at n=16A045470
• a(n) = prime(n) + n^3 + n^2 + 4n - 1.at n=36A060822
• Column 4 of A061315.at n=8A061319
• Triangular numbers in which the k-th digit, numbering them from right to left, either divides k or is a nonzero multiple of k. Is 1 only when k has no other single-digit divisor (less than 10).at n=15A069558
• Triangular numbers in which the k-th significant digit either divides k or is a multiple of k.at n=28A069559
• Triangular numbers which are 7-almost primes.at n=19A076581
• a(n) = n^2 * (n^2 - 1)/2.at n=17A083374
• Triangular numbers with palindromic indices.at n=41A089717
• Triangular numbers whose sum of squared digits is also triangular.at n=22A094890
• Expansion of (1-x)^2/((1-x)^3-5x^3).at n=12A097124
• Expansion of 1/((1-x^2)*sqrt(1-4*x)).at n=9A106188
• a(n) = (n+1)*(n+2)^3*(n+3)*(2n+3)*(2n+5)/360.at n=7A107970
• Triangular numbers for which the sum of the digits is a heptagonal number.at n=37A117312
• Triangular numbers for which the sum of the digits equals the sum of the digits of the next triangular number.at n=16A117511
• Sophie Germain triangular numbers tr: 2*tr+1 is also a triangular number.at n=7A124174
• Alexandrian integers: numbers of the form n = p*q*r such that 1/n = 1/p - 1/q - 1/r for some integers p,q,r.at n=32A147811
• Row sums of the triangle A045975.at n=17A204558
• Triangular numbers which are leg of a Pythagorean triple with hypotenuse in A213188.at n=43A213189
• Sequences A124174 and A006454 interlaced.at n=14A217278
• Triangular numbers that are the product of a triangular number and an oblong number.at n=22A253652