28441

Appears in sequences

• Convolution of natural numbers n >= 1 with Fibonacci numbers F(k), for k >= 6.at n=13A037157
• Triangular number x such that x + reverse of x is a prime.at n=11A072387
• Triangular numbers obtained as a concatenation of successive terms of A081847.at n=32A082235
• Sort the digits of these triangular numbers into descending order and drop zeros to get primes.at n=31A082923
• Row sums of A102427.at n=15A102429
• Triangle read by rows: matrix product of the binomial coefficients with the Stirling numbers of the second kind.at n=40A126350
• Triangular numbers congruent to 1 or 5 mod 6.at n=39A128880
• Triangle read by rows: A008277 * A007318.at n=40A137597
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+239)^2 = y^2.at n=9A204765
• Triangular numbers of the form 2p-1 where p is prime.at n=32A217000
• Primitive numbers in A229307.at n=24A229311
• A290865(n) -(n-1).at n=30A290876
• Odd composite integers m such that A000045(2*m-J(m,5)) == 1 (mod m), where J(m,5) is the Jacobi symbol.at n=25A340118
• Weight multiplicities for 248-dimensional irreducible representation of the Lie algebra E_8.at n=14A340523
• Triangular numbers (A000217) whose second arithmetic derivative (A068346) is also a triangular number.at n=42A351131
• Numbers k that divide the k-th central Delannoy number.at n=40A372901
• a(n) = number of primes between n^2 and n^4.at n=24A380332
• Composite numbers k such that ((2^k+1)/3)^k == 1 (mod k^2).at n=39A384438