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A067750 Numbers k whose last digit is the k-th digit of Pi. 2

%I #17 Feb 17 2021 07:42:02

%S 1,18,43,47,50,78,79,88,102,104,112,123,129,169,199,225,226,228,249,

%T 254,259,270,276,281,283,286,292,302,313,315,318,325,330,340,345,355,

%U 360,381,384,399,407,415,426,436,454,459,462,464,471,503,515,516,520

%N Numbers k whose last digit is the k-th digit of Pi.

%C Let d(n) be the n-th digit of Pi=3.14159... so d(1)=1, d(2)=4 etc. d(123)=3 and 3 is the last digit of 123 hence 123 is in the sequence.

%t With[{pids=Rest[RealDigits[Pi,10,610][[1]]]},Transpose[Select[Table[ {n,First[Take[pids,{n,n}]]},{n,600}],Mod[First[#],10]==Last[#]&]][[1]]] (* _Harvey P. Dale_, Sep 15 2011 *)

%Y Cf. A000796 (Pi), A067757, A067789.

%K easy,nonn,base

%O 1,2

%A _Benoit Cloitre_, Mar 07 2002

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)