38009

Appears in sequences

• a(n) = (10n+1)*(10n+9).at n=19A001535
• Composite numbers whose prime factors contain no digits other than 1 and 9.at n=24A036309
• Composite numbers n such that sigma(n)+12 = sigma(n+12).at n=10A054902
• Composite numbers k such that both phi(k+12) = phi(k) + 12 and sigma(k+12) = sigma(k) + 12.at n=3A056777
• Numbers k such that exactly three d in the range d <= k/2 exist which divide binomial(k-d-1,d-1) and which are not coprime to k.at n=22A178099
• Composite numbers n such that n'=(n+12)', where n' is the arithmetic derivative of n.at n=5A257107
• Sequence of pairwise relatively prime numbers of class P_6 (see comment in A275246).at n=22A275251
• Sum of primes between 100*n and 100*n + 99.at n=34A276355
• Number of partitions of n with up to six distinct kinds of 1.at n=30A320693
• Triangle read by rows, T(n, k) = Sum_{j=0..k} |Stirling1(n, j)|.at n=40A349782
• a(n) = Sum_{j=0..n} |Stirling1(2*n, j)|.at n=4A349783