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

Author

Hauke Löffler, Jul 24 2019

Keywords

• nonn
• base

Examples

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

Crossrefs

Cf. A002385, A037024, A000796, A014777.

Programs

SageMath

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