A167180 - OEIS

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A167180

a(n) = pi(n) plus the number of nonprimes less than prime(n).

1, 2, 4, 5, 9, 10, 14, 15, 18, 23, 25, 30, 34, 35, 38, 43, 49, 50, 56, 59, 60, 65, 69, 74, 81, 84, 85, 88, 90, 93, 107, 110, 115, 116, 125, 126, 132, 137, 140, 145, 151, 152, 162, 163, 166, 167, 179, 190, 193, 194, 197, 202, 204, 213, 218, 223, 228, 229, 235, 238, 240 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`The number of primes less than n plus number of nonprimes less than n-th prime.`
	LINKS	`Table of n, a(n) for n=1..61.`
	FORMULA	`a(n)=A000720(n)+A014689(n).`
	MAPLE	`Contribution from R. J. Mathar, May 21 2010: (Start)` `A000720 := proc(n) numtheory[pi](n) ; end proc:` `A014689 := proc(n) ithprime(n) -n ; end proc:` `A167180 := proc(n) A000720(n)+A014689(n) ; end proc: seq(A167180(n), n=1..120) ; (End)`
	CROSSREFS	`Sequence in context: A024618 A089221 A113755 * A091271 A063985 A050052` `Adjacent sequences: A167177 A167178 A167179 * A167181 A167182 A167183`
	KEYWORD	`nonn`
	AUTHOR	`Juri-Stepan Gerasimov, Oct 29 2009`
	EXTENSIONS	`Corrected (89 replaced by 88, 94 by 93, 127 by 126, 146 by 145 etc.) by R. J. Mathar, May 21 2010`
	STATUS	`approved`

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Last modified May 25 16:33 EDT 2013. Contains 225647 sequences.