23725

Appears in sequences

• Quadrinomial coefficients: C(2+n,n) + C(3+n,n) + C(4+n,n).at n=24A005718
• 11-gonal (or hendecagonal) pyramidal numbers: a(n) = n*(n+1)*(3*n-2)/2.at n=25A007586
• Numerator of sum of -6th powers of divisors of n.at n=5A017675
• Numbers that are the sum of 2 nonzero squares in exactly 6 ways.at n=16A025289
• Numbers that are the sum of 2 nonzero squares in 5 or more ways.at n=24A025296
• Numbers that are the sum of 2 nonzero squares in 6 or more ways.at n=16A025297
• Numbers that are the sum of 2 distinct nonzero squares in exactly 6 ways.at n=16A025307
• Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways.at n=22A025315
• Numbers that are the sum of 2 distinct nonzero squares in 6 or more ways.at n=16A025316
• a(n) = (2*n+1)*(9*n+1).at n=36A033573
• Denominators of continued fraction convergents to sqrt(298).at n=10A041561
• Average of squares of successive primes: a(n) = (prime(n+1)^2 + prime(n)^2)/2, with n >= 2.at n=34A075892
• Numbers m that are the hypotenuse of exactly 22 distinct integer-sided right triangles, i.e., m^2 can be written as a sum of two squares in 22 ways.at n=16A097103
• Smallest integer y satisfying the Pell equation x^2 - n*y^2 = -1 for the values of n given in A031396.at n=53A130227
• Elements of A011185 that are also the sum of a pair of distinct elements of A011185.at n=18A133605
• Terms in A046034 which are pairwise products of terms in A046034.at n=22A153446
• Numerator of Euler(n, 2/29).at n=3A157269
• G.f. is the polynomial (Product_{k=1..26} (1 - x^(3*k)))/(1-x)^26.at n=4A162718
• a(n) = Sum_{i=0..n} digsum(i)^3, where digsum(i) = A007953(i).at n=49A231688
• a(n) is the smallest n-gonal pyramidal number greater than 1 which is also n-gonal; a(n) = 0 when one does not exist.at n=8A308488