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A084970 Numbers whose smallest prime factor is 13. 5
13, 169, 221, 247, 299, 377, 403, 481, 533, 559, 611, 689, 767, 793, 871, 923, 949, 1027, 1079, 1157, 1261, 1313, 1339, 1391, 1417, 1469, 1651, 1703, 1781, 1807, 1937, 1963, 2041, 2119, 2171, 2197, 2249, 2327, 2353, 2483, 2509, 2561, 2587, 2743, 2873 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

Index entries for linear recurrences with constant coefficients, order 481.

FORMULA

a(n) = a(n-480) + 30030 = a(n-1) + a(n-480) - a(n-481). - Charles R Greathouse IV, Nov 19 2014

lim a(n)/n = A038111(6)/A038110(6) = 62.5625 as n goes to infinity. - Vladimir Shevelev, Jan 20 2015

MATHEMATICA

Select[ 13Range@ 225, GCD[#, 2310] == 1 &] (* Robert G. Wilson v, Dec 18 2014 *)

PROG

(PARI) is(n)=n%13==0 && gcd(n, 2310)==1 \\ Charles R Greathouse IV, Nov 19 2014

CROSSREFS

Sixth row of A083140.

Sequence in context: A171318 A078362 A157381 * A209226 A208503 A207696

Adjacent sequences:  A084967 A084968 A084969 * A084971 A084972 A084973

KEYWORD

nonn,easy

AUTHOR

Robert G. Wilson v, Jun 15 2003

EXTENSIONS

More terms from David Wasserman, Oct 19 2004

STATUS

approved

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Last modified June 25 19:53 EDT 2017. Contains 288729 sequences.