49455
domain: N
Appears in sequences
- Triangular numbers for which the sum of the digits equals the sum of the digits of the next triangular number.at n=15A117511
- Triangular numbers for which the sum of the digits is a cube.at n=17A117803
- Triangular numbers composed of digits {4,5,9}.at n=4A119208
- Numbers k such that Fibonacci(prime(k)) is prime.at n=40A119984
- a(n) = prime(2^(n+1)) - 2*prime(2^n).at n=15A197072
- Triangular numbers T from A000217 such that (4*T+1)/13 is prime.at n=17A208294
- Triangular numbers that in base 2 have the same number of 0's and 1's.at n=34A345348
- G.f. A(x) satisfies A(x) = 1 + x^4 * (A(x) / (1 - x))^3.at n=18A364403