a(n) is the square spiral number of the initial digit of the number placed at the n-th move of the Prime scrabble game: placing integers on a grid one digit per cell as to form primes, with minus sign in case of vertical placement.
A332067
a(n) is the square spiral number of the initial digit of the number placed at the n-th move of the Prime scrabble game: placing integers on a grid one digit per cell as to form primes, with minus sign in case of vertical placement.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =8a(4) =5a(5) =18a(6) =19a(7) =23a(8) =13a(9) =15a(10) =20a(11) =37a(12) =11a(13) =68a(14) =150a(15) =-26a(16) =44a(17) =70a(18) =-47a(19) =-114a(20) =53a(21) =-216a(22) =-35a(23) =-77a(24) =103a(25) =64a(26) =-32a(27) =61a(28) =31a(29) =146
External references
- oeis: A332067