28467

Appears in sequences

• a(n) is the starting position of the first occurrence of a string of at least n 3's in the decimal expansion of Pi.at n=3A050282
• a(n) is the starting position of the first occurrence of a string of at least n 3's in the decimal expansion of Pi.at n=4A050282
• Starting positions of strings of three 3's in the decimal expansion of Pi.at n=16A083610
• Starting positions of strings of four 3's in the decimal expansion of Pi.at n=0A083611
• Starting positions of strings of five 3's in the decimal expansion of Pi.at n=0A083612
• L-th order palindromes with L > 2.at n=27A089381
• Index of first occurrence of exactly n consecutive threes in a row in the decimal expansion of Pi.at n=4A096757
• A restricted class of multiple edge-free maps on n edges.at n=11A220900
• a(n) = Sum_{k=0..floor(n/4)} 2^k * 3^(n-3*k) * binomial(2*(n-3*k),2*k).at n=8A391757