24976

Appears in sequences

• Even triangular numbers with prime indices.at n=25A034955
• Triangular numbers with sum of digits = 28.at n=3A068132
• Triangular numbers which are 6-almost primes.at n=18A076580
• Row sums of triangle A093922.at n=19A093925
• Number of zero-one matrices with n ones and no zero rows or columns.at n=5A101370
• Numbers of the form prime(n) + prime(n+1) - 2 that are also triangular numbers, T(k) = k(k+1)/2.at n=21A110891
• Hexagonal numbers for which the sum of the digits is also a hexagonal number.at n=25A117062
• Triangular numbers n*(n+1)/2 with n prime and n+1 nonprime.at n=46A144519
• Triangular numbers p*(p+1)/2 with p prime such that 1+(number of prime factors of p+1) is prime.at n=20A144549
• Triangle, read by rows, T(n, k) = binomial(n*binomial(n, k), k).at n=38A157108
• Number of (w,x,y,z) with all terms in {0,...,n} and odd range.at n=14A212890
• a(n)=a(n-1)+floor((a(n-2)+a(n-3))/2), with a(n)=n for n<3.at n=25A214040
• Numbers decremented by their digit product produce a cube.at n=34A229184
• Triangular numbers which have one or more occurrences of exactly five different digits.at n=16A241788
• E.g.f. sqrt(1-t^2)*exp(t*(1+arctanh(t))).at n=9A255432
• The intersection of hexagonal numbers (A000384) and centered 9-gonal numbers (A060544).at n=37A272399
• Triangular numbers that are repdigits with length > 2 in some base.at n=21A274084
• Numbers with a minimum of 6 polygonal roots, excluding itself.at n=26A275256
• Numbers n such that A277118(n) = 17.at n=11A277119
• Number of unlabeled rooted trees with n vertices and more than two branches of the root.at n=14A331233