777777777

Appears in sequences

• a(n) = 7*(10^n - 1)/9.at n=9A002281
• Smallest number containing n syllables in UK English.at n=33A002810
• Fancy primitive repdigit polygonal numbers.at n=20A033704
• Fancy primitive repdigit polygonal numbers (with multiplicity).at n=22A033705
• Smallest positive integer requiring n syllables to pronounce in American English.at n=30A045736
• Worthless numbers: numbers without h, o, r, t, or w.at n=19A073419
• Smallest multiple of n using only digits 0 and 7.at n=8A078246
• a(n) = A084006(n)^(1/2).at n=27A084007
• Copies of 7,3 and 1 cyclically such that every partial concatenation is a prime.at n=3A110792
• a(n) is the least positive integer in base 10 containing n sevens that is divisible by n.at n=8A112904
• a(10n+m) is the integer with n+m concatenations of the digit m in base 10, 0<=m<=9.at n=26A158849
• a(n) = 111111111 * n.at n=6A172525
• Numbers n such that the decimal digits of n are not present in k*n, k=2..9.at n=26A175637
• In base 10 lunar arithmetic, a(n) is the smallest number than has exactly n different square roots (or -1 if no such number exists).at n=7A202174
• Numbers with all digits equal and from the set {1, 3, 7, 9}.at n=34A338712
• Repdigit numbers that are divisible by 7.at n=17A366596
• Repdigits which are also Harshad numbers.at n=24A377228