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A067367
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Primes p such that the number of digits in p! is also prime.
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1
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5, 23, 29, 43, 89, 107, 139, 193, 199, 211, 229, 239, 313, 347, 419, 457, 587, 641, 661, 673, 701, 739, 863, 877, 1091, 1097, 1103, 1217, 1259, 1283, 1361, 1381, 1447, 1493, 1549, 1607, 1609, 1663, 1693, 1741, 1861, 1973, 1987, 2083, 2251, 2351, 2399, 2423
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(1)=5 because 5!=120 has 3 (prime) digits.
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MATHEMATICA
| Select[ Select[ Range[2500], PrimeQ[ Floor[ Log[10, #! ] + 1]] & ], PrimeQ[ # ] & ]
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CROSSREFS
| Cf. A035065.
Sequence in context: A196243 A018527 A084411 * A140386 A105880 A163587
Adjacent sequences: A067364 A067365 A067366 * A067368 A067369 A067370
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KEYWORD
| nonn,base
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AUTHOR
| Sudipta Das (juitech(AT)vsnl.net), Feb 23 2002
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EXTENSIONS
| Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 28 2002
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