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A033871 Divisors = 3 (mod 4) of Descartes's 198585576189. 4
3, 7, 11, 19, 39, 63, 91, 99, 143, 147, 171, 183, 231, 247, 363, 399, 427, 507, 539, 627, 671, 819, 847, 931, 1083, 1159, 1183, 1287, 1463, 1859, 1911, 2223, 2299, 2379, 2527, 3003, 3211, 3843, 3971, 4719, 4851, 5187, 5551, 6039 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The number 198585576189 (which is the only known odd spoof-perfect number, cf. A174292) has 486 divisors, 240 of which are congruent to 3 modulo 4. - M. F. Hasler, Feb 17 2017

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..240

EXAMPLE

198585576189 = 3^2 * 7^2 * 11^2 * 13^2 * 19^2 * 61.

PROG

(PARI) lista() = {fordiv(198585576189, d, if (d % 4 == 3, print1(d, ", "))); } \\ Michel Marcus, Jul 14 2013

(PARI) select(d->d%4==1, divisors(198585576189)) \\ M. F. Hasler, Feb 17 2017

CROSSREFS

Cf. A033870, A222262.

Sequence in context: A132447 A132449 A132453 * A060288 A191245 A282914

Adjacent sequences:  A033868 A033869 A033870 * A033872 A033873 A033874

KEYWORD

easy,fini,nonn,full

AUTHOR

Naohiro Nomoto

EXTENSIONS

Corrected by Michel Marcus, Jul 14 2013

STATUS

approved

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Last modified July 17 08:42 EDT 2019. Contains 325098 sequences. (Running on oeis4.)