login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A105977 Near-repdigit primes with 7 as repeated digit. 4
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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 7 11:56 EDT 2022. Contains 355148 sequences. (Running on oeis4.)