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A172182 Nonprimes of the form 6k + 1 or 6k + 2. 1
1, 8, 14, 20, 25, 26, 32, 38, 44, 49, 50, 55, 56, 62, 68, 74, 80, 85, 86, 91, 92, 98, 104, 110, 115, 116, 121, 122, 128, 133, 134, 140, 145, 146, 152, 158, 164, 169, 170, 175, 176, 182, 187, 188, 194, 200, 205, 206, 212, 217, 218, 224, 230, 235, 236, 242, 247 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..57.

FORMULA

a(n) ~ 3n. - Charles R Greathouse IV, May 25 2011

PROG

(MAGMA) A172182:=func<n | exists{k: k in [0..n div 6] | n in [6*k+1, 6*k+2] and not IsPrime(n)}>; [ n: n in [1..247] | A172182(n) ];  // Bruno Berselli, May 25 2011

CROSSREFS

Cf. A045375.

Sequence in context: A309355 A063288 A136798 * A091575 A091572 A096786

Adjacent sequences:  A172179 A172180 A172181 * A172183 A172184 A172185

KEYWORD

nonn,easy

AUTHOR

Juri-Stepan Gerasimov, Jan 28 2010

EXTENSIONS

Entries checked by R. J. Mathar, May 22 2010

Retitled by Charles R Greathouse IV, May 25 2011

STATUS

approved

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Last modified July 25 03:53 EDT 2021. Contains 346283 sequences. (Running on oeis4.)