A245627 Base 10 digit sum of 11*n.

0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 2, 4, 6, 8, 10, 12, 14, 16, 18, 11, 4, 6, 8, 10, 12, 14, 16, 18, 11, 13, 6, 8, 10, 12, 14, 16, 18, 11, 13, 15, 8, 10, 12, 14, 16, 18, 11, 13, 15, 17, 10, 12, 14, 16, 18, 11, 13, 15, 17, 19, 12, 14, 16, 18, 11, 13, 15, 17, 19, 21, 14, 16, 18, 11, 13, 15, 17, 19, 21, 23, 16, 18, 11, 13, 15, 17, 19, 21, 23, 25, 18, 2

Offset: 0

Author

Alonso del Arte, Jul 27 2014

Keywords

• nonn
• base
• easy

Comments

First term that differs from A136614 is a(91) = 2, compared to A136614(91) = 11.

Examples

			a(90) = 18 because 11 * 90 = 990 and 9 + 9 + 0 = 18.
a(91) = 2 because 11 * 91 = 1001 and 1 + 0 + 0 + 1 = 2.
		

Links

• Robert Israel, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A008593, A007953.

Programs

Maple

a:= n -> convert(convert(11*n,base,10),`+`):
seq(a(n),n=0..100); # Robert Israel, Aug 01 2014

Mathematica

Table[Plus@@IntegerDigits[11n], {n, 0, 99}]

PARI

a(n) = sumdigits(11*n); \\ Michel Marcus, Aug 03 2014

Formula

a(n) = A007953(A008593(n)). - Tom Edgar, Jul 27 2014