19983

Appears in sequences

• Number of quasi-orders with n elements.at n=8A006870
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 94.at n=39A031592
• 5-digit terms in the continued fraction for Pi.at n=25A048960
• Recip transform of 2*(1 + x^5 + x^6)-1/(1-x).at n=8A049166
• Irregular triangle read by rows: the number of hydrocarbon structures that can be drawn with a given number of carbons and units of unsaturation.at n=53A134819
• Number of ordered triples (a,b,c) of positive integers less than n with the property that n divides a*b*c.at n=47A352078