155554

Appears in sequences

• Number of partitions of floor(7n/2)-1 into n nonnegative integers each no greater than 7.at n=30A001980
• (10^n-1) * (n+9) / 9.at n=5A091692
• a(n)*n = A112904(n).at n=4A112905
• Twice repdigit numbers.at n=43A152966
• Numbers k having at least two complementary pairs of divisors (q, p) and (p', q') such that k = p*q = p'*q' where the decimal digits of p' are the 9's complement of the decimal digits of p and the decimal digits of q' are the 9's complement of the decimal digits of q.at n=27A226587
• Pseudoprimes to base 7, written in base 7.at n=39A262104