68069

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/29 ).at n=39A011939
• Carryless squares of carryless primes (cf. A169887).at n=34A169904
• Cyclops numbers with circular digits {0,6,8,9}.at n=21A274765
• Expansion of e.g.f. S(x) satisfying S(x) = sinh( x*cosh( 2*x*sqrt(1 + S(x)^2) ) ), where a(n) is the coefficient of x^(2*n+1)/(2*n+1)! in S(x) for n >= 0.at n=3A372812