A196750 Numbers n such that 3, 5, 7 and 11 do not divide swing(n) = A056040(n).

0, 1, 2, 6320

Offset

1,3

Comments

It is conjectured that there are no other terms.

Links

Table of n, a(n) for n=1..4.

Peter Luschny, On the prime factors of the swinging factorial.

Maple

# The function Search is defined in A196747.
A196750_list := n -> Search(n, [3, 5, 7, 11]):  # n is a search limit

Prog

(PARI) valp(n, p)=my(s); while(n\=p, s+=n); s
is(n)=valp(n, 3)==2*valp(n\2, 3) && valp(n, 5)==2*valp(n\2, 5) && valp(n, 7)==2*valp(n\2, 7) && valp(n, 11)==2*valp(n\2, 11) \\ Charles R Greathouse IV, Feb 02 2016

Crossrefs

Cf. A005836, A129508, A030979, A151750, A196747, A196748, A196749.

Sequence in context: A129060 A190127 A099690 * A349512 A107021 A107022

Adjacent sequences: A196747 A196748 A196749 * A196751 A196752 A196753

Keyword

nonn,bref

Author

Peter Luschny, Oct 06 2011

Status

approved