47477

Appears in sequences

• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 21.at n=30A051986
• McKay-Thompson series of class 22A for Monster.at n=30A058567
• Largest k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k, or 0 if no such k exists.at n=8A130181
• Number of set partitions of [n] with a strongly unimodal block size list.at n=11A275389
• Numbers with digits 4 and 7 only.at n=41A284971
• Lexicographically first sequence of distinct terms such that the sum of any two terms is not a term of the sequence, and the sum of any two digits is not a digit of the sequence.at n=43A302938