42237

Appears in sequences

• Concatenate n-th composite number with concatenation of its prime factors in ascending order.at n=27A245315
• Record values in permutation A267107.at n=14A268394
• Numbers k such that k = rad(k) * sopfr(k), where rad(k) is the squarefree kernel of k and sopfr(k) the integer log of k.at n=20A280935
• Numbers of the form A000217(n)*A007494(n) that are divisible by 3.at n=31A295867
• a(n) = Sum_{p in P} y(1)*y(2), where P is the set of partitions of n, and y(k) is the number of parts with multiplicity at least k in p.at n=30A316861
• Smallest positive integer whose smallest coprime divisor shift is n.at n=28A366219
• Numbers formed by concatenating n with the distinct prime factors of n, left to right, smallest factors to largest, with a(1) = 10.at n=41A367918
• Composite numbers for which A324644(n)/A324198(n) = 2 and sigma(n) == 2 (mod 4).at n=39A371082