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.
MATHEMATICA
Select[Divisors[198585576189], Mod[#, 4]==3&] (* Harvey P. Dale, Jan 07 2023 *)
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
KEYWORD
easy,fini,nonn,full
AUTHOR
EXTENSIONS
Corrected by Michel Marcus, Jul 14 2013
STATUS
approved