A070869 - OEIS

A070869

a(1) = 16; a(n+1) = sum of a(n) and (a(n) written in base 2 and reversed).

16, 17, 34, 51, 102, 153, 306, 459, 882, 1197, 2646, 4347, 11484, 15273, 24864, 25443, 50886, 76329, 152274, 229371, 458742, 688113, 1277910, 2162607, 6193008, 6684333, 12631680, 12729219, 25434054, 38529033, 76302162, 115562715

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

REFERENCES

S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 125.

LINKS

Table of n, a(n) for n=1..32.

EXAMPLE

To get a(2) note that 16 = 10000 in base 2, reversing gives 00001, or 1 and so a(2) = 16 + 1 = 17.

MATHEMATICA

a[1] = 16; a[n_] := Block[{b = IntegerDigits[ a[n - 1], 2]}, FromDigits[ b + Reverse[b], 2]]; Table[ a[n], {n, 1, 35}]

CROSSREFS

Sequence in context: A041514 A041512 A267029 * A101196 A064637 A115942

Adjacent sequences: A070866 A070867 A070868 * A070870 A070871 A070872

KEYWORD

nonn,easy,base

AUTHOR

N. J. A. Sloane, May 19 2002

EXTENSIONS

More terms from Robert G. Wilson v, May 20 2002

STATUS

approved