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

Author

Eric Angelini, Aug 30 2005

Keywords

• easy
• nonn

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.

Crossrefs

Cf. A005228, A030124.

Formula

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

Extensions

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