A032642 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A032642

Numbers k such that k concatenated with k+2 is a lucky number.

%I #11 Jul 28 2021 04:21:40

%S 1,7,19,25,31,49,61,65,71,77,101,103,107,121,125,133,139,149,157,169,

%T 173,193,205,221,233,245,295,349,359,371,385,391,413,425,431,445,457,

%U 463,479,481,517,527,533,553,575,583,587,593,605,611,617,637,641,643

%N Numbers k such that k concatenated with k+2 is a lucky number.

%Y Cf. A000959, A032652.

%K nonn,base

%O 1,2

%A _Patrick De Geest_, May 15 1998

%E More terms from _Sascha Kurz_, Mar 24 2002