7777777

Appears in sequences

• Concatenate n n times.at n=6A000461
• a(n) = 7*(10^n - 1)/9.at n=7A002281
• Smallest number containing n syllables in UK English.at n=25A002810
• Repdigital lucky numbers.at n=13A031882
• Smallest positive integer requiring n syllables to pronounce in American English.at n=23A045736
• Numbers with digits nondecreasing and their reciprocals sum to 1/(positive integer).at n=46A045910
• Replace each 1 in decimal expansion of n with 1 1's, each 2 with 2 2's, etc. (0 vanishes).at n=6A048376
• Concatenate p p times, where p runs through the primes.at n=3A048795
• n times (n 1's): a(n) = n*(10^n - 1)/9.at n=7A053422
• a(n) is the largest number whose product of decimal digits equals n^n.at n=5A068186
• a(n) is the smallest number such that the product of its decimal digits equals n^n, or 0 if no solutions exist.at n=6A068187
• Worthless numbers: numbers without h, o, r, t, or w.at n=15A073419
• Squarefree numbers obtained by repeating a single digit.at n=36A077571
• Numbers with digits in nondecreasing order such that sum of the reciprocals of the digits is 1.at n=29A091783
• Integers are written in the form abcd...n where "a" means: This integer contains "a" times the digit b; "b" means: This integer contains "b" times the digit c; "c" means: This integer contains "c" times the digit d; ... and "n" means nothing.at n=25A105959
• a(n) is the least positive integer in base 10 containing n sevens that is divisible by n.at n=6A112904
• a(n) is the largest base-9 string such that the n-th number coprime to 9 does not divide any substring of a(n).at n=4A114911
• a(10n+m) is the integer with n+m concatenations of the digit m in base 10, 0<=m<=9.at n=6A158849
• a(n) is formed by 2n+1 concatenations of the digit 2r+1 where n=r (mod 5).at n=3A158859
• Numbers n such that the decimal digits of n are not present in k*n, k=2..9.at n=20A175637