21220

Appears in sequences

• Sum of 10 nonzero 8th powers.at n=36A003388
• Numbers that are the sum of 5 positive 9th powers.at n=9A003394
• Numbers that are the sum of at most 5 positive 9th powers.at n=34A004889
• Expansion of Product_{m>=1} (1+q^m)^(-5).at n=22A022600
• n written in fractional base 3/2.at n=21A024629
• Numerators of continued fraction convergents to sqrt(524).at n=9A042002
• G.f. A(x) satisfies A(x)^3 = A(x^3) + 3*x.at n=13A107092
• G.f. A(x) satisfies: A(x) = A(x^3)^(1/3) + 3*x.at n=39A107093
• Sum of two consecutive primes that is also sum of two consecutive even positive squares.at n=8A236461
• Number of partitions of n such that (number parts having multiplicity 1) is not a part and (number of 1s) is not a part.at n=45A241509
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 493", based on the 5-celled von Neumann neighborhood.at n=30A272545
• Exponential transform of the ninth powers A001017.at n=3A279642
• a(n) = 2*a(n-1) - a(n-4) for n >= 4, where a(0) = 2, a(1) = 4, a(2) = 6, a(3) = 10, a(4) = 16.at n=16A288599
• a(n) is the number of partitions of n without repeated odd parts such that the total number of parts congruent to 0,3, or 5 modulo 8 is even.at n=55A335745
• G.f. A(x) satisfies: (1 - x*A(x))^3 = 1 - 3*x - x^3*A(x^3).at n=12A352702