72771

Appears in sequences

• Smallest triangular number containing exactly n 7's.at n=2A036524
• Indices of primes in sequence defined by A(0) = 77, A(n) = 10*A(n-1) - 23 for n > 0.at n=9A056258
• Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.at n=30A073873
• Union of A080105 and A080106.at n=45A080078
• Round(226*phi^n).at n=25A080106
• Smith triangular numbers.at n=13A098840
• Triangular numbers composed of digits {1,2,7}.at n=5A119105
• Triangular numbers composed of only digits with line segments or both line segments and curves {1, 2, 4, 5, 7}.at n=22A247021
• a(n) = (m(n)^2 + 3)*(m(n)^2 + 7)/32, where m(n) = 2*n - 1.at n=19A336535
• Hexagonal numbers that are sphenic numbers.at n=37A380007
• Expansion of e.g.f. 1/sqrt(1 - 2*x*exp(x)).at n=6A380015