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

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

Offset: 1

Author

N. J. A. Sloane, Oct 30 2014

Keywords

• nonn
• base

References

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

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
• D. R. Kaprekar, The Mathematics of the New Self Numbers [annotated and scanned]

Crossrefs

Cf. A003052, A249045-A249048.

Programs

Haskell

a249047 n = a249047_list !! (n-1)
a249047_list = filter ((> 0) . flip mod 3) a003052_list
-- Reinhard Zumkeller, Oct 31 2014