131877

Appears in sequences

• Two numbers k and l we call equivalent if they have the same vector of exponents with positive components in prime power factorization. Let a(1)=1, a(2)=3. If n>=3 is prime, then a(n) is the smallest prime greater than a(n-1); otherwise, a(n)>a(n-1) is the smallest number equivalent to n such that prime power factorization of a(n) contains only primes which already appeared in the sequence.at n=19A178443
• 1/9 the number of (n+1) X 5 0..2 arrays with all 2 X 2 subblocks having the same four values.at n=15A184043
• Subdiagonal partitions: number of partitions (p1, p2, p3, ...) of n with pi <= i.at n=52A238875