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A048884 Numbers n such that sigma(n) - n = n - pi(n) - 1 where pi(n) is A000720. 0
1, 5, 9, 26, 236, 244, 4862, 5396, 6868, 9608, 9704, 23764, 82665, 733064, 25881904, 25886864, 33299110, 261851668 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(19) > 3*10^12. - Giovanni Resta, Mar 31 2017

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

For[i = 1, i < 10^9, i++, If[DivisorSigma[1, i] - i == i - PrimePi[i] - 1, Print[i]]; ]; - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 29 2006

CROSSREFS

Cf. A037172.

Sequence in context: A038251 A034498 A219499 * A077915 A222357 A271685

Adjacent sequences:  A048881 A048882 A048883 * A048885 A048886 A048887

KEYWORD

more,nonn

AUTHOR

Naohiro Nomoto

EXTENSIONS

More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 29 2006

STATUS

approved

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Last modified February 22 23:32 EST 2018. Contains 299472 sequences. (Running on oeis4.)