171787

Appears in sequences

• Convolution of nonzero squares A000290 with themselves.at n=20A033455
• a(1) = 7; a(n) is the smallest multiple of a(n-1) that contains all the digits of a(n-1) and is not a multiple of 10.at n=3A077706
• One sixtieth the product of primitive Pythagorean triangles' sides whose odd values differ by 2.at n=10A081219
• Number of (n+6)X7 0..1 matrices with each 7X7 subblock idempotent.at n=8A224581