Kaori at 81

EIGHTY-ONE (81) FOR KAORI'S BIRTHDAY 2014

3 raised to the 4th power = 3 x 3 x 3 x 3 = 81

Tribonacci Numbers: 0, 0, 1, 1, 2, 4, 7, 13, 24, 44, 81, 149, 274. . .

Perfect Totient Number, Open Meandric Number, 9th in Mian-Chowla Sequence

CENTERED OCTAGONAL NUMBERS 
nth centered octagonal number = 4n(n-1) + 1 

1, 9, 25, 49, 81, 121, 169. . .    

also
1

1 + 8 = 9

1 + 8 + 16 = 25  

1 + 8 + 16 + 24 = 49

1 + 8 + 16 + 24 + 32 = 81


HEPTAGONAL NUMBERS
nth heptagonal number = n(5n-3)/2 

1, 7, 18, 34, 55, 81, 112, 148, 189. . .    

also
  1 
  1 + ( 7 -  1) = 7

  7 + (14 - 3) = 18

18 + (21 - 5) = 34

34 + (28 - 7) = 55

55 + (35 - 9) = 81


MY 1933 BIRTHMATES; 

Oliver Saks, Monserrat Caballé, Krzysztof Penderecki, Yevgeny Yevtushenko, Roman Polanski, Gene Wilder, Michael Caine, Yoko Ono, Chita Rivera, Joan Collins, Quincy Jones, Cecily Tyson, Jean-Paul Belmondo, David McCullough, Carol Burnett, et al