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A165971 The n-th odd nonprime minus the n-th even nonprime. 1
1, 5, 9, 13, 15, 15, 19, 19, 21, 25, 27, 27, 29, 29, 33, 33, 35, 39, 39, 41, 43, 43, 45, 45, 45, 47, 51, 55, 57, 57, 57, 57, 57, 57, 59, 61, 61, 65, 65, 65, 65, 69, 69, 71, 71, 73, 75, 75, 77, 77, 81, 81, 81, 81, 85, 89, 89, 89, 89, 89, 91, 91, 91, 91, 91, 93, 97, 99, 99, 103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

FORMULA

a(n) = A014076(n) - A163300(n).

Equals: {1} U A160522.

EXAMPLE

a(1) = 1-0 = 1. a(2) = 9-4 = 5. a(3) = 15-6 = 9.

MATHEMATICA

A014076 := Select[Range@500, ! PrimeQ@# && OddQ@# &]; A163300 := Drop[Range[0, 500, 2], {2}]; Table[(-A163300[[n]] + A014076[[n]]), {n, 1, 50}] (* G. C. Greubel, Sep 17 2017 *)

CROSSREFS

Cf. A014076, A163300, A141468, A160522.

Sequence in context: A080579 A325274 A303264 * A160522 A314651 A194371

Adjacent sequences:  A165968 A165969 A165970 * A165972 A165973 A165974

KEYWORD

nonn,less

AUTHOR

Juri-Stepan Gerasimov, Oct 02 2009

EXTENSIONS

77 duplicated by R. J. Mathar, Oct 10 2009

STATUS

approved

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Last modified March 5 15:52 EST 2021. Contains 341825 sequences. (Running on oeis4.)