A353023 Positive integers k with the property that they cannot be converted to a multiple of 11 by changing at most a single decimal digit.
545, 27272, 1818181, 636363636, 90909090909, 181818181818, 272727272727, 363636363636, 454545454545, 545454545454, 636363636363, 727272727272, 818181818181, 909090909090, 363636363636363, 81818181818181818, 7272727272727272727, 454545454545454545454
Offset: 1
Links
- Ben Weiss, Multiples of 11
Crossrefs
Cf. A008593 (multiples of 11).
Formula
a(n) = a(n - 18) * 10^22 + (a(n - 18) mod 100) * 101010101010101010101.
Comments