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A061193
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Number of digits in n-th even perfect number (A000396).
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2
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1, 2, 3, 4, 8, 10, 12, 19, 37, 54, 65, 77, 314, 366, 770, 1327, 1373, 1937, 2561, 2663, 5834, 5985, 6751, 12003, 13066, 13973, 26790, 51924, 66530, 79502, 130100, 455663, 517430, 757263, 841842, 1791864, 1819050, 4197919
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| The next known value is 8107892 but this may not be the next one.
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REFERENCES
| Martin Gardner, Mathematical Magic Show. Alfred A. Knopf. 1977 p. 165
Paul Hoffman, Archimedes' Revenge. Penguin. 1988 p. 11
Donald D. Spencer, Key Dates in Number Theory History. Camelot Pub.Co. 1995 p. 80.
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LINKS
| A. Byerley, Relationship Between Mersenne Primes and Perfect Numbers
C. K. Caldwell, Table of Known Mersenne Primes
C. K. Caldwell, Table of Known Mersenne Primes.
J. O. M. Pedersen, Tables of Aliquot Cycles
H. J. Smith, Mersenne Primes
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CROSSREFS
| Cf. A000396.
Sequence in context: A174816 A161494 A121612 * A180941 A135772 A051783
Adjacent sequences: A061190 A061191 A061192 * A061194 A061195 A061196
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KEYWORD
| nonn,base
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), May 30 2001
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EXTENSIONS
| More terms from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Apr 16 2003
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