A083811 Numbers n such that 2n+1 is the digit reversal of n+1.

36, 396, 3996, 39996, 399996, 3999996, 39999996, 399999996, 3999999996, 39999999996, 399999999996, 3999999999996

Offset

1,1

Comments

1. a(n) = 36 + 360 + 3600+ ...+ up to n terms. a(n) = sum of n terms of the geometric progression with the first term 36 and common ratio 10. 2. a(n) = 36*A000042(n).( the unary sequence).

Links

Table of n, a(n) for n=1..12.

Formula

a(n) = 4*(10^n - 1).

Example

36 + 1 = 37, 2*36 + 1 = 73.

Crossrefs

Cf. A000042.

Sequence in context: A160280 A307959 A095682 * A086575 A203027 A164583

Adjacent sequences: A083808 A083809 A083810 * A083812 A083813 A083814

Keyword

base,nonn

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 08 2003

Status

approved