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A214153 Numbers k for which k and tau(k) are both congruent to 1 modulo 3. 1
1, 10, 22, 34, 46, 55, 58, 64, 82, 85, 91, 94, 106, 112, 115, 118, 133, 142, 145, 166, 178, 187, 202, 205, 208, 214, 217, 226, 235, 247, 253, 259, 262, 265, 274, 280, 295, 298, 301, 304, 319, 334, 343, 346, 355, 358, 382, 391, 394, 403, 415, 427, 445, 451 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
The divisors of 10 are: 1, 2, 5, 10 (4 divisors). 10 and 4 are both congruent to 1 modulo 3. Thus 10 is a member of this sequence.
MATHEMATICA
Select[Range[1, 500, 3], Mod[DivisorSigma[0, #], 3] == 1 &] (* T. D. Noe, Jul 09 2012 *)
CROSSREFS
Intersection of A016777 and A211337.
Cf. A000005.
Sequence in context: A367918 A109958 A053361 * A179887 A339003 A017641
KEYWORD
nonn
AUTHOR
Gerasimov Sergey, Jul 05 2012
STATUS
approved

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Last modified July 12 15:21 EDT 2024. Contains 374251 sequences. (Running on oeis4.)