OFFSET
1,6
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
MAPLE
N:= 10^10: # to consider all terms with 4^i*7^j<=N
S:= {seq(seq(4^i*7^j, j=0..floor(log[7](N/4^i))), i=0..floor(log[4](N)))}:
map(padic:-ordp, sort(convert(S, list)), 7); # Robert Israel, Aug 11 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved