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A017641 a(n) = 12n + 10. 7
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, 538, 550, 562, 574, 586, 598, 610, 622, 634 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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 Janjic, Dec 16 2007

LINKS

Table of n, a(n) for n=0..52.

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (2,-1).

FORMULA

A030132(a(n)) = 9. - Reinhard Zumkeller, Jul 04 2007

a(n) = 24*n - a(n-1) + 8, (with a(0)=10). - Vincenzo Librandi, Dec 24 2010

MATHEMATICA

Range[10, 1000, 12] (* Vladimir Joseph Stephan Orlovsky, May 29 2011 *)

PROG

(Sage) [i+10 for i in range(527) if gcd(i, 12) == 12] # Zerinvary Lajos, May 21 2009

(PARI) a(n)=12*n+10 \\ Charles R Greathouse IV, Jul 10 2016

CROSSREFS

Cf. A008594, A017533, A017545, A017593.

Sequence in context: A053361 A214153 A179887 * A232540 A217573 A276626

Adjacent sequences:  A017638 A017639 A017640 * A017642 A017643 A017644

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified March 22 22:17 EDT 2017. Contains 283901 sequences.