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

1, 18, 43, 47, 50, 78, 79, 88, 102, 104, 112, 123, 129, 169, 199, 225, 226, 228, 249, 254, 259, 270, 276, 281, 283, 286, 292, 302, 313, 315, 318, 325, 330, 340, 345, 355, 360, 381, 384, 399, 407, 415, 426, 436, 454, 459, 462, 464, 471, 503, 515, 516, 520

Offset

1,2

Comments

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.

Links

Table of n, a(n) for n=1..53.

Mathematica

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 *)

Crossrefs

Cf. A000796 (Pi), A067757, A067789.

Sequence in context: A380846 A304152 A252747 * A043362 A023735 A045300

Adjacent sequences: A067747 A067748 A067749 * A067751 A067752 A067753

Keyword

easy,nonn,base

Author

Benoit Cloitre, Mar 07 2002

Status

approved