33321
domain: N
Appears in sequences
- Numbers whose base-8 representation has exactly 6 runs.at n=29A043628
- Roman numerals written using 1 for I, 2 for V, 3 for X, 4 for L, 5 for C, 6 for D, 7 for M.at n=35A061493
- Apocalypse primes: 10^665+a(n) has 666 decimal digits and is prime.at n=19A115983
- a(n) = a(n-2) + a(n-4) + a(n-5) + a(n-7) + a(n-8) + a(n-10) for n >= 10, with a(0) = ... = a(9) = 1.at n=34A122762
- Sum of quadratic residues of (n-th prime == 3 mod 4).at n=39A282035
- Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p.at n=19A282041
- Numbers k such that 7*10^k - 47 is prime.at n=25A282457
- a(n) = 324*n^2 - 564*n + 321 (n>=1).at n=10A304617
- a(n) is the number of irreducible element forms for Z/pZ, with p = prime(n).at n=6A308164
- Approximation of the 5-adic integer exp(-5) up to 5^n.at n=7A309903
- Numbers k that divide the smallest number whose sum of digits is k.at n=22A342810
- Expansion of (1 - x^3 + x^4)/((1 - x^3 + x^4)^2 - 4*x^4).at n=30A376788