A075145 Prime basis of A061373.

2, 3, 5, 6, 8, 8, 9, 9, 11, 11, 11, 11, 12, 12, 14, 13, 14, 13, 14, 14, 13, 14, 15, 15, 14, 15, 15, 16, 14, 15, 15, 16, 16, 17, 16, 16, 16, 15, 18, 17, 18, 16, 17, 16, 17, 17, 17, 17, 18, 17, 18, 18, 17, 18, 17, 19, 19, 17, 19, 18, 20, 18, 18, 19, 18, 19, 19, 18, 20, 19, 19, 21

Offset: 1

Author

Henry Bottomley, Sep 04 2002

Keywords

• nonn

Comments

Since A061373 is pseudo-logarithmic with A061373(m*n)=A061373(m)+A061373(n) for m,n>1, its prime basis is sufficient to define it.

Formula

a(n)=A061373(A000040(n)), where p(n)=A000040(n) lists the primes. If p(n)-1 is written as product p(i)^e_i, then a(n) = 1 + sum a(i)*e_i.