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A005347
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First differences of A005579.
(Formerly M0690)
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1
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1, 1, 2, 3, 5, 8, 13, 20, 34, 53, 88, 143, 236, 387, 641, 1061, 1763, 2937, 4903, 8202, 13750, 23095
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| This is example 42 in Guy's paper. The first seven terms are the same as the Fibonacci sequence A000045. Subsequent terms deviate from Fibonacci. - T. D. Noe (noe(AT)sspectra.com), May 08 2006
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REFERENCES
| R. K. Guy, The second strong law of small numbers. Math. Mag. 63 (1990), no. 1, 3-20.
Laatsch, Richard; Measuring the abundancy of integers. Math. Mag. 59 (1986), no. 2, 84-92.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
| a(n)=A005579(n+1)-A005579(n) - T. D. Noe (noe(AT)sspectra.com), May 08 2006
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CROSSREFS
| Cf. A005579 (least number of distinct prime factors in even numbers having an abundancy index >n).
Sequence in context: A092834 A080106 A158415 * A100582 A193616 A093093
Adjacent sequences: A005344 A005345 A005346 * A005348 A005349 A005350
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), R. K. Guy
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