Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A067367
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A067367 Primes p such that the number of digits in p! is also prime. +0
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

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

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


AT&T Labs Research