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Search: id:A017641
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| 10, 22, 34, 46, 58, 70, 82, 94, 106, 118, 130, 142, 154, 166, 178, 190, 202, 214, 226, 238, 250, 262, 274, 286, 298, 310, 322, 334, 346, 358, 370, 382, 394, 406, 418, 430, 442, 454, 466, 478, 490, 502, 514, 526
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Exponents e such that x^e+x^2-1 is reducible.
If Y is a 4-subset of an (2n+1)-set X then, for n>=3, a(n-2) is the number of 3-subsets of X having at least two elements in common with Y. - Milan R. Janjic (agnus(AT)blic.net), Dec 16 2007
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LINKS
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Tanya Khovanova, Recursive Sequences
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FORMULA
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A030132(a(n)) = 9. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 04 2007
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PROGRAM
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(Other) sage: [i+10 for i in range(527) if gcd(i, 12) == 12] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 21 2009]
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CROSSREFS
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Cf. A017593.
Sequence in context: A007366 A109958 A053361 this_sequence A028569 A014367 A063710
Adjacent sequences: A017638 A017639 A017640 this_sequence A017642 A017643 A017644
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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