

A331411


Position of the start of a 5digit sequence in the decimal digits of Pi such that the first, third, and fifth terms of that 5digit sequence are the same.


0



334, 412, 415, 646, 763, 764, 851, 854, 987, 1097, 1110, 1172, 1224, 1591, 1756, 1782, 1915, 2025, 2144, 2156, 2203, 2205, 2279, 2381, 2907, 3273, 3362, 3813, 3865, 3973, 4140, 4174, 4256, 4289, 4307, 4507, 4672, 4986, 5224, 5230, 5265, 5311, 5313, 5345
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..44.


EXAMPLE

The five decimal digits of Pi starting at the 412th digit are {5,7,5,9,5}. Because the first, third, and fifth of those five digits are the same, 412 is a term of the sequence.


MATHEMATICA

With[{pid=RealDigits[Pi, 10, 10000][[1]]}, SequencePosition[pid, {x_, _, x_, _, x_}]][[All, 1]] (* Requires Mathematica version 10 or later *)


CROSSREFS

Sequence in context: A221827 A158859 A182098 * A020367 A254705 A184463
Adjacent sequences: A331408 A331409 A331410 * A331412 A331413 A331414


KEYWORD

nonn


AUTHOR

Harvey P. Dale, Jan 16 2020


STATUS

approved



