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A065090 Natural numbers which are not odd primes: composites plus 1 and 2. 19
1, 2, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000

FORMULA

A151763(a(n)) = 0.

PROG

(PARI) { n=0; for (m=1, 10^9, if (!isprime(m) || m==2, write("b065090.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Oct 06 2009

(Haskell)

import Data.List (elemIndices)

a065090 n = a065090_list !! (n-1)

a065090_list = map (+ 1) $ elemIndices 0 a151763_list

-- Reinhard Zumkeller, Oct 06 2011

CROSSREFS

Cf. A002808, A006005.

Complement of A065091.

Sequence in context: A189466 A085492 A338924 * A324560 A227197 A285517

Adjacent sequences:  A065087 A065088 A065089 * A065091 A065092 A065093

KEYWORD

nonn,easy

AUTHOR

Labos Elemer, Nov 12 2001

STATUS

approved

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Last modified July 23 22:20 EDT 2021. Contains 346265 sequences. (Running on oeis4.)