Numbers in a hexagonal tiling (seen as concentric rings) which have exactly three neighbors whose difference from it is prime.
A372223
Numbers in a hexagonal tiling (seen as concentric rings) which have exactly three neighbors whose difference from it is prime.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =19a(4) =20a(5) =37a(6) =61a(7) =128a(8) =217a(9) =271a(10) =398a(11) =919a(12) =1519a(13) =1520a(14) =2978a(15) =3170a(16) =4220a(17) =4447a(18) =4681a(19) =5677a(20) =5941a(21) =6488a(22) =8269a(23) =9920a(24) =10621a(25) =12481a(26) =16651a(27) =17558a(28) =22448a(29) =26227
External references
- oeis: A372223