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A069682 Primes with either no internal digits or all internal digits are 7. 8
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 173, 179, 271, 277, 373, 379, 479, 571, 577, 673, 677, 773, 877, 971, 977, 1777, 2777, 3779, 5779, 6779, 8779, 27773, 27779, 47777, 47779, 57773, 67777, 77773, 97771 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

CROSSREFS

Cf. A069675, A069676, A069677, A069678, A069679, A069680, A069681, A069683, A069684.

Sequence in context: A069679 A069680 A069681 * A069683 A069684 A061022

Adjacent sequences:  A069679 A069680 A069681 * A069683 A069684 A069685

KEYWORD

nonn,base

AUTHOR

Amarnath Murthy, Apr 06 2002

EXTENSIONS

Corrected by Ray Chandler, Nov 24 2003

Offset corrected and name changed by Arkadiusz Wesolowski, Sep 07 2011

STATUS

approved

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Last modified July 12 13:21 EDT 2020. Contains 335663 sequences. (Running on oeis4.)