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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

Amiram Eldar, Table of n, a(n) for n = 1..10000

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: A302280 A109958 A053361 * A179887 A339003 A017641

Adjacent sequences:  A214150 A214151 A214152 * A214154 A214155 A214156

KEYWORD

nonn

AUTHOR

Gerasimov Sergey, Jul 05 2012

STATUS

approved

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Last modified May 14 22:40 EDT 2021. Contains 343909 sequences. (Running on oeis4.)