

A101259


Numbers n whose deficiency is 54.


0




OFFSET

1,1


COMMENTS

No more elements found up to 2*10^7.  Stefan Steinerberger, Feb 04 2006


LINKS

Table of n, a(n) for n=1..7.
V. K. Tintschev, Cofacient Numbers.


EXAMPLE

87 is a term of the sequence because 3*29 = 87 and 87  29  3 = g(87) = 55 [see Tintschev link].


MATHEMATICA

Do[ If[ DivisorSigma[1, n] + 54 == 2n, Print[n]], {n, 10^7}] (* Robert G. Wilson v, Dec 22 2004 *)


PROG

(MAGMA) [n: n in [1..2*10^7]  DivisorSigma(1, n)+54 eq 2*n]; // Vincenzo Librandi, Jul 30 2015


CROSSREFS

Cf. A101223.
Sequence in context: A044800 A067749 A063349 * A063336 A129515 A133524
Adjacent sequences: A101256 A101257 A101258 * A101260 A101261 A101262


KEYWORD

nonn,more


AUTHOR

Vassil K. Tintschev (tinchev(AT)sunhe.jinr.ru), Dec 17 2004


EXTENSIONS

a(7) from Donovan Johnson, Dec 23 2008


STATUS

approved



