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

1,1

Links

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

Example

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

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 *)

Crossrefs

Sequence in context: A142542 A142127 A142831 * A297891 A236803 A048525

Adjacent sequences: A105974 A105975 A105976 * A105978 A105979 A105980

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 29 2005

Status

approved