OFFSET
1,3
COMMENTS
Smallest positive m such that m-th truncated square pyramid number tsp(m)=m*(7*m-1)*(2*m-1)/6 is divisible by n!, n=0,1,.. .
EXAMPLE
a(3)=3 because tsp(3)=126 is divisible by 3!: 126/3!=21
a(5)=23 because tsp(23)=27600 is divisible by 5!: 27600/5!=230
a(6)=608 because tsp(608)=523875600 is divisible by 6!: 523875600/6!=727605.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Zak Seidov, Aug 03 2009
STATUS
approved