OFFSET
1,3
COMMENTS
All numbers of the form 2^k, k>=0, are in the sequence.
EXAMPLE
8 is a term as bin(8)*reverse(bin(8)) = 100_2*1_2 = 100_2 contains '100' as a substring.
27 is a term as bin(27)*reverse(bin(27)) = 11011_2*11011_2 = 1011011001_2 contains '11011' as a substring.
108 is a term as bin(108)*reverse(bin(108)) = 1101100_2*11011_2 = 101101100100_2 contains '1101100' as a substring.
139 is a term as bin(139)*reverse(bin(139)) = 10001011_2*11010001_2 = 111000101111011_2 contains '10001011' as a substring.
PROG
(PARI) strbin(x) = Str(fromdigits(binary(x), 10));
isok(m) = {my(p = m*fromdigits(Vecrev(binary(m)), 2)); #strsplit(strbin(p), strbin(m)) > 1; } \\ Michel Marcus, Mar 01 2021
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Scott R. Shannon, Mar 01 2021
STATUS
approved