A105977 Near-repdigit primes with 7 as repeated digit.

277, 577, 677, 727, 757, 773, 787, 797, 877, 977, 1777, 2777, 7177, 7477, 7577, 7717, 7727, 7757, 7877, 47777, 67777, 71777, 76777, 77377, 77477, 77747, 77773, 77797, 77977, 79777, 97777, 727777, 773777, 775777, 777277, 777677, 777737, 777787

Offset: 1

Author

Shyam Sunder Gupta, Apr 29 2005

Keywords

• base
• nonn

Examples

			a(2)=577 is a term because all digits are equal to 7 except one.
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Programs

Mathematica

Select[Union[FromDigits/@(Flatten[Permutations/@Flatten[ Table[ PadRight[ {n},i,7],{n,9},{i,3,6}],1],1])],PrimeQ] (* Harvey P. Dale, Dec 12 2015 *)