A038490 Sums of 2 distinct powers of 11.

12, 122, 132, 1332, 1342, 1452, 14642, 14652, 14762, 15972, 161052, 161062, 161172, 162382, 175692, 1771562, 1771572, 1771682, 1772892, 1786202, 1932612, 19487172, 19487182, 19487292, 19488502, 19501812, 19648222, 21258732, 214358882, 214358892, 214359002, 214360212, 214373522, 214519932, 216130442

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

seq(seq(11^i+11^j, i=0..j-1), j=1..10); # Robert Israel, Jun 21 2018

Mathematica

Take[Union[Plus@@@Subsets[11^Range[0, 20], {2}]], 50] (* Harvey P. Dale, Dec 16 2010 *)

Prog

(Python)
from math import isqrt
def A038490(n): return 11**(m:=isqrt(n<<3)+1>>1)+11**(n-1-(m*(m-1)>>1)) # Chai Wah Wu, Apr 04 2025

Crossrefs

Base 11 interpretation of A038444.

Sequence in context: A332603 A358615 A231869 * A329360 A037551 A134584

Adjacent sequences: A038487 A038488 A038489 * A038491 A038492 A038493

Keyword

nonn,easy

Author

Olivier Gérard

Extensions

More terms from Vincenzo Librandi, Aug 06 2009

a(33)=214373522 inserted by Robert Israel, Jun 21 2018

Status

approved