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A249047 Self-numbers (A003052) that are not divisible by 3. 2
1, 5, 7, 20, 31, 53, 64, 86, 97, 110, 121, 143, 154, 176, 187, 209, 211, 233, 244, 266, 277, 299, 310, 323, 334, 356, 367, 389, 400, 413, 424, 446, 457, 479, 490, 512, 514, 536, 547, 569, 580, 602, 613, 626, 637, 659, 670, 692, 703, 716 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately printed, 311 Devlali Camp, Devlali, India, 1963.
LINKS
D. R. Kaprekar, The Mathematics of the New Self Numbers [annotated and scanned]
PROG
(Haskell)
a249047 n = a249047_list !! (n-1)
a249047_list = filter ((> 0) . flip mod 3) a003052_list
-- Reinhard Zumkeller, Oct 31 2014
CROSSREFS
Sequence in context: A117321 A279252 A279957 * A258282 A192422 A120035
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Oct 30 2014
STATUS
approved

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Last modified May 21 14:18 EDT 2024. Contains 372738 sequences. (Running on oeis4.)