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Padovan sequence information


In number theory, the Padovan sequence is the sequence of integers P(n) defined[1] by the initial values

and the recurrence relation

The first few values of P(n) are

1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, 16, 21, 28, 37, 49, 65, 86, 114, 151, 200, 265, ... (sequence A000931 in the OEIS)

A Padovan prime is a Padovan number that is prime. The first Padovan primes are:

2, 3, 5, 7, 37, 151, 3329, 23833, 13091204281, 3093215881333057, 1363005552434666078217421284621279933627102780881053358473, 1558877695141608507751098941899265975115403618621811951868598809164180630185566719, ... (sequence A100891 in the OEIS).
Spiral of equilateral triangles with side lengths which follow the Padovan sequence.

The Padovan sequence is named after Richard Padovan who attributed its discovery to Dutch architect Hans van der Laan in his 1994 essay Dom. Hans van der Laan : Modern Primitive.[2] The sequence was described by Ian Stewart in his Scientific American column Mathematical Recreations in June 1996.[3] He also writes about it in one of his books, "Math Hysteria: Fun Games With Mathematics". [4]

The above definition is the one given by Ian Stewart and by MathWorld. Other sources may start the sequence at a different place, in which case some of the identities in this article must be adjusted with appropriate offsets.

  1. ^ Weisstein, Eric W. "Padovan Sequence". MathWorld..
  2. ^ Richard Padovan. Dom Hans van der Laan: modern primitive: Architectura & Natura Press, ISBN 9789071570407.
  3. ^ Ian Stewart, Tales of a Neglected Number, Scientific American, No. 6, June 1996, pp. 92-93.
  4. ^ Ian Stewart (2004), Math hysteria: fun and games with mathematics, Oxford University Press, p. 87, ISBN 978-0-19-861336-7.

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