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

0, 1, 2, 6320

Offset: 1

Author

Peter Luschny, Oct 06 2011

Keywords

• nonn
• bref

Comments

It is conjectured that there are no other terms.

Links

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

Crossrefs

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

Programs

Maple

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

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