A178556 Primes with exactly seven 7's.

77767777, 77777177, 77777377, 77777747, 137777777, 172777777, 177677777, 177776777, 177777377, 177777577, 177777727, 177777773, 177777779, 177797777, 197777777, 272777777, 277177777, 277727777, 277771777, 277775777, 277777177

Offset: 1

Author

Lekraj Beedassy, May 29 2010

Keywords

• nonn
• base

Crossrefs

Cf. A038618, A178550-5, A178557-8

Programs

Mathematica

Select[Prime[Range[45*10^5,152*10^5]],DigitCount[#,10,7]==7&] (* Harvey P. Dale, Dec 20 2022 *)