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1, 4, 3, 12, 6, 30, 10, 50, 15, 60, 21, 84, 28, 140, 36, 180, 45, 180, 55, 220, 66, 330, 78, 390, 91, 364, 105, 420, 120, 600, 136, 680, 153, 612, 171, 684, 190, 950, 210, 1050, 231, 924, 253, 1012, 276, 1380, 300, 1500, 325, 1300, 351, 1404, 378, 1890, 406
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Norman Sullivan, Test Your Own IQ, Workman Publishing Co. New York, NY, 1994, pp. 48, 50.
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,2000
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PROG
| (PARI) { f="b061727.txt"; for (n=1, 1000, a=n*(n + 1)/2; if (a%2, t=a*4, t=a*5); write(f, 2*n - 1, " ", a); write(f, 2*n, " ", t) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 27 2009]
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CROSSREFS
| Cf. A000217, A061726.
Sequence in context: A091512 A106285 A193800 * A055527 A055523 A168430
Adjacent sequences: A061724 A061725 A061726 * A061728 A061729 A061730
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KEYWORD
| nonn,dumb,easy
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), May 05 2001
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jun 25 2002
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