A109592 Sequence and first differences include all even numbers exactly once and no odd numbers.

2, 6, 14, 24, 36, 52, 70, 90, 112, 138, 166, 196, 228, 262, 300, 340, 382, 426, 472, 520, 570, 624, 680, 738, 798, 860, 924, 990, 1058, 1130, 1204, 1280, 1358, 1438, 1520, 1604, 1690, 1778, 1870, 1964, 2060, 2158, 2258, 2360, 2464, 2570, 2678, 2788, 2902

Offset

1,1

Comments

First differences = 2*A030124.

References

E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.

Links

Table of n, a(n) for n=1..49.

Formula

a(n) = 2*A005228(n).

Crossrefs

Cf. A005228, A030124.

Sequence in context: A239877 A032386 A074329 * A238410 A256482 A106353

Adjacent sequences: A109589 A109590 A109591 * A109593 A109594 A109595

Keyword

easy,nonn

Author

Eric Angelini, Aug 30 2005

Extensions

Edited, corrected and extended by Ray Chandler, Sep 06 2005

Status

approved