Decomposition of A063037
Numbers without 3 consecutive equal binary digits.
Decomposition of A063638
Primes p such that p-2 is a semiprime.
Decomposition of A063825
(n-3, n-5, n-17, n-257, n-65537) are all primes.
Decomposition of Unitary untouchable numbers
Unitary untouchable numbers: us(x) = n has no solution where us(x) (A063919) is the sum of the proper unitary divisors of x.
Decomposition of Pillai primes
Pillai primes: p such that there exists an integer m such that m!+1 is 0 mod p and p is not 1 mod m.
Decomposition of Unusual numbers
Not sqrt(n)-smooth: some prime factor of n is > sqrt(n).
Decomposition of A064150
Numbers divisible by the sum of their ternary digits.
Decomposition of A064194
a(2n) = 3*a(n), a(2n+1) = 2*a(n+1)+a(n), with a(1) = 1.
Decomposition of A064437
a(1)=1, a(n)=a(n-1)+3 if n is already in the sequence, a(n)=a(n-1)+2 otherwise.
Decomposition of A064700
Numbers n that are divisible by the multiplicative digital root of n.