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A080641 a(1) = 4; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) which is consistent with the condition "n is a member of the sequence if and only if a(n) is divisible by 5". 0
4, 6, 7, 10, 11, 15, 20, 21, 22, 25, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 45, 50, 51, 52, 55, 56, 57, 58, 59, 60, 65, 70, 75, 76, 80, 85, 90, 95, 100, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 120, 125, 126, 127, 130, 135, 140, 145, 150, 155, 156, 157 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..62.

B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence, J. Integer Seqs., Vol. 6 (2003), #03.2.2.

B. Cloitre, N. J. A. Sloane and M. J. Vandermast, Numerical analogues of Aronson's sequence (math.NT/0305308)

Index entries for sequences of the a(a(n)) = 2n family

FORMULA

{a(a(n))} = {5i, i >= 2}.

CROSSREFS

Cf. A080639, A080640, A079000.

Sequence in context: A096887 A268574 A023631 * A272632 A229744 A191920

Adjacent sequences:  A080638 A080639 A080640 * A080642 A080643 A080644

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane and Benoit Cloitre, Feb 28 2003

EXTENSIONS

More terms from Matthew Vandermast, Feb 28 2003

STATUS

approved

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Last modified November 11 15:36 EST 2019. Contains 329016 sequences. (Running on oeis4.)