A007479 Earliest sequence with a(a(a(n))) = 2n. (Formerly M2513)

0, 3, 6, 5, 12, 2, 10, 9, 24, 11, 4, 14, 20, 15, 18, 17, 48, 26, 22, 21, 8, 23, 28, 38, 40, 27, 30, 29, 36, 50, 34, 33, 96, 35, 52, 62, 44, 39, 42, 41, 16, 74, 46, 45, 56, 47, 76, 86, 80, 51, 54, 53, 60, 98, 58, 57, 72, 59, 100, 110, 68, 63, 66, 65

Offset

0,2

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Delbert L. Johnson, Table of n, a(n) for n = 0..19999

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

Formula

a(0) = 0, a(2*n) = 2*a(n), a(6*n+1) = 6*n+3, a(6*n+3) = 6*n+5, a(6*n+5) = 12*n+2. - Sean A. Irvine, Jan 05 2018

Crossrefs

Cf. A002516.

Sequence in context: A096620 A331124 A299209 * A076535 A349102 A285327

Adjacent sequences: A007476 A007477 A007478 * A007480 A007481 A007482

Keyword

easy,nonn,nice

Author

N. J. A. Sloane

Extensions

Missing a(48) = 80 inserted by Sean A. Irvine, Jan 05 2018

Status

approved