77757

Appears in sequences

• Numbers having four 7's in base 10.at n=26A043520
• Near-repdigit semiprimes with 7 as repeated digit.at n=31A105988
• Expansion of 1/(1 - x) * Product_{k>=0} 1/(1 - x^(3^k))^(3^(k+1)).at n=16A321344
• Moving the rightmost digit of a number to place it furthest to the left adds 18 to the number.at n=30A363823
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units, where one trapezoid has a larger base of n units.at n=36A391453