128778

Appears in sequences

• Number of unrooted quartic trees with 2n (unlabeled) nodes and possessing a bicentroid; number of 2n-carbon alkanes C(2n)H(4n+2) with a bicentroid, ignoring stereoisomers.at n=9A010373
• Triangular numbers whose sum of squared digits is also triangular.at n=30A094890
• Numbers of the form prime(n) + prime(n+1) - 2 that are also triangular numbers, T(k) = k(k+1)/2.at n=37A110891
• Greatest number m such that the fractional part of Pi^A153711(m) >= 1-(1/m).at n=8A153715
• Triangular numbers which are sums of 6 consecutive primes.at n=11A173423
• Triangular numbers that are repdigits with length > 2 in some base.at n=33A274084
• a(n) = (m(n)^2 + 3)*(m(n)^2 + 7)/32, where m(n) = 2*n - 1.at n=22A336535
• Numbers that can be represented as p^r + q^s with 4 distinct odd primes p, q, r, s.at n=18A390179