38600

Appears in sequences

• a(n) = Sum_{k + l*m <= n} (k + l*m), with 0 <= k,l,m <= n.at n=26A106846
• Start with a(1)=1; for n >= 1, a(n+1)=a(n)+a(k) with k=[n - n-th digit of sqrt(2)]. If k<0 or k=0, then a(k)=0.at n=38A133393
• First differences of A160379.at n=35A163989
• Irregular triangle read by rows: T(n,k) (n>=2, 0<=k<=n) = total number of unbranched k-catapolyheptagons with k pentagons and n-k heptagons.at n=47A323850