280212

Appears in sequences

• Starting positions of strings of four 8's in the decimal expansion of Pi.at n=28A083638
• Number of n X n binary matrices with no initial bit string in any row or column divisible by 6.at n=5A181036
• T(n,k)=Number of nXk binary matrices with no initial bit string in any row or column divisible by 6.at n=60A181039
• a(n) = Sum_{d|n} d^(d + n/d).at n=5A294956
• E.g.f.: 1 / (1 - Sum_{k>=1} x^prime(k) / prime(k)!).at n=10A347948