A309343 Position of start of first occurrence of palindromic prime(n) after the decimal point in expansion of Pi.

6, 9, 4, 13, 94, 852, 1096, 393, 728, 1944, 858, 934, 5229, 25, 405, 631, 647, 1259, 416, 1853, 78246, 182558, 13736, 53100, 38835, 58726, 54516, 97930, 8827, 11000, 69516, 5795, 183115, 161674, 320336, 41934, 55891, 71399, 65195, 189109, 21045, 49012

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Example

First occurrence of palindromic prime(5) = 11 starts at the 94th digit after the decimal point, hence a(5) = 94.

Prog

(SageMath)
def postionInPi(n):
  return str(N(pi, 2000000))[1:].find(str(n))
[ postionInPi(i) for i in A002385[0:200] ]

Crossrefs

Cf. A002385, A037024, A000796, A014777.

Sequence in context: A216638 A110649 A037024 * A254276 A021939 A069864

Adjacent sequences: A309340 A309341 A309342 * A309344 A309345 A309346

Keyword

nonn,base

Author

Hauke Löffler, Jul 24 2019

Status

approved