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A156987
Primes using all the prime digits 2, 3, 5, 7 repeated in strings, in that order.
0
2357, 23357, 23557, 223577, 233357, 233557, 235577, 2235557, 2335577, 2355557, 22223557, 22233577, 22333357, 22335557, 22355777, 23333357, 222223357, 222233357, 222235777, 222333557, 222355577, 223335577, 223577777, 233357777
OFFSET
1,1
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Feb 20 2009
EXTENSIONS
Missing values inserted by R. J. Mathar, Mar 06 2009
STATUS
approved