id:A067367 - OEIS Search Results

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Primes p such that the number of digits in p! is also prime.

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2

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; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(1)=5 because 5!=120 has 3 (prime) digits.`
	MATHEMATICA	`Select[ Select[ Range[2500], PrimeQ[ Floor[ Log[10, #! ] + 1]] & ], PrimeQ[ # ] & ]`
	CROSSREFS	`Cf. A035065.` `Sequence in context: A167804 A018527 A084411 this_sequence A140386 A105880 A163587` `Adjacent sequences: A067364 A067365 A067366 this_sequence A067368 A067369 A067370`
	KEYWORD	`nonn,base`
	AUTHOR	`Sudipta Das (juitech(AT)vsnl.net), Feb 23 2002`
	EXTENSIONS	`Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 28 2002`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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