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A249047 Self-numbers (A003052) that are not divisible by 3. 2

%I #12 Dec 25 2021 18:35:23

%S 1,5,7,20,31,53,64,86,97,110,121,143,154,176,187,209,211,233,244,266,

%T 277,299,310,323,334,356,367,389,400,413,424,446,457,479,490,512,514,

%U 536,547,569,580,602,613,626,637,659,670,692,703,716

%N Self-numbers (A003052) that are not divisible by 3.

%D D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately printed, 311 Devlali Camp, Devlali, India, 1963.

%H Reinhard Zumkeller, <a href="/A249047/b249047.txt">Table of n, a(n) for n = 1..10000</a>

%H D. R. Kaprekar, <a href="/A003052/a003052_2.pdf">The Mathematics of the New Self Numbers</a> [annotated and scanned]

%o (Haskell)

%o a249047 n = a249047_list !! (n-1)

%o a249047_list = filter ((> 0) . flip mod 3) a003052_list

%o -- _Reinhard Zumkeller_, Oct 31 2014

%Y Cf. A003052, A249045-A249048.

%K nonn,base

%O 1,2

%A _N. J. A. Sloane_, Oct 30 2014

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Last modified June 20 12:38 EDT 2024. Contains 373527 sequences. (Running on oeis4.)