20194

Appears in sequences

• a(n) = 3^n + 2^n - 1.at n=9A005056
• Self-convolution of composite numbers.at n=33A023648
• 0 together with numbers k such that 4*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=12A099412
• Number of partitions of n with more even parts than odd parts.at n=44A108949
• Number of partitions of n^2 into factorial parts.at n=17A197182
• Sum of all odd numbers in Collatz (3x+1) trajectory of n.at n=30A213916
• Rectangular array T(n,m), read by upward antidiagonals: T(n,m) is the number of difunctional (regular) binary relations between an n-element set and an m-element set.at n=46A265417
• Rectangular array T(n,m), read by upward antidiagonals: T(n,m) is the number of difunctional (regular) binary relations between an n-element set and an m-element set.at n=53A265417
• Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1.at n=29A368702