A328839 Smallest prime not dividing n times smallest prime not dividing A276087(n).

4, 15, 4, 21, 4, 25, 4, 21, 4, 33, 4, 15, 4, 33, 4, 21, 4, 25, 4, 39, 4, 39, 4, 15, 4, 39, 4, 51, 4, 21, 4, 21, 4, 15, 4, 25, 4, 33, 4, 39, 4, 15, 4, 39, 4, 39, 4, 25, 4, 51, 4, 51, 4, 15, 4, 51, 4, 33, 4, 21, 4, 33, 4, 21, 4, 25, 4, 39, 4, 39, 4, 15, 4, 51, 4, 51, 4, 25, 4, 51, 4, 57, 4, 15, 4, 39, 4, 57, 4, 21, 4, 39, 4, 51, 4

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..32768

Index entries for sequences related to primorial numbers

Formula

a(n) = A053669(n) * A328579(n).

Prog

(PARI)
A053669(n) = forprime(p=2, , if(n%p, return(p))); \\ From A053669
A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };
A328579(n) = A053669(A276086(A276086(n)));
A328839(n) = (A053669(n) * A328579(n));

Crossrefs

Cf. A010709 (odd bisection), A053669, A276086, A276087, A328578, A328579.

Cf. A328585 (positions of the prime squares).

Sequence in context: A128235 A357116 A024547 * A143899 A154068 A309526

Adjacent sequences: A328836 A328837 A328838 * A328840 A328841 A328842

Keyword

nonn

Author

Antti Karttunen, Oct 29 2019

Status

approved