140040

Appears in sequences

• Base 7 digital convolution sequence.at n=12A033644
• Numbers m such that sigma(m)*tau(m) is a square but sigma(m)/tau(m) is not an integer.at n=33A327831
• a(n) is the number of tetrapods standing on the four edges of an n X n grid, so that no two feet are the same distance apart and no foot is on a corner. Tetrapods with congruent footprints are counted only once.at n=32A353447