2,2

Natural numbers of the form (n!-m)/m :

for m=1 n!-1 see A033312

for m=2 (n!-2)/2 see A139172

for m=3 (n!-3)/3 see A139173

for m=4 (n!-4)/4 see A139174

for m=5 (n!-5)/5 see A139175

for m=6 (n!-6)/6 see A139176

for m=7 (n!-7)/7 see A139177

for m=8 (n!-8)/8 see A139178

for m=9 (n!-9)/9 see A139183

for m=10 (n!-10)/10 see A139184

Contribution from Artur Jasinski (grafix(AT)csl.pl), Oct 14 2008: (Start)

a(n) = Number of numbers removed in first step of Eratosthenes' sieve for n!

a(5)=A145532(1) a(6)=A145533(1) a(7)=A145534(1) a(8)=A145535(1) a(9)=A145536(1) a(10)=A145537(1) (End)

Table[(n! - 2)/2, {n, 2, 20}]

Cf. A033312, A139172, A139173, A139174, A139175, A139176, A139177, A139183, A139184.

Sequence in context: A020057 A140547 A054564 this_sequence A164034 A074615 A126034

Adjacent sequences: A139169 A139170 A139171 this_sequence A139173 A139174 A139175

nonn

Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008