Decomposition of 5n + 3
5n+3.
Decomposition of A018805
Number of elements in the set {(x,y): 1<=x,y<=n, gcd(x,y)=1}.
Decomposition of A018825
Numbers that are not the sum of 2 nonzero squares.
Decomposition of Hoax numbers
Hoax numbers: composite numbers whose digit-sum equals the sum of the digit-sums of its distinct prime factors.
Decomposition of A019546
Primes whose digits are primes.
Decomposition of A020670
Numbers of form x^2 + 7y^2.
Decomposition of A020756
Numbers which are the sum of two triangular numbers.
Decomposition of A020757
Numbers that are not the sum of two triangular numbers.
Decomposition of A022449
c(p(n)) where p(k) is k-th prime including p(1)=1 and c(k) is k-th composite number.
Decomposition of A022544
Numbers that are not the sum of 2 squares.