A073302 Indices of prime digits (2, 3, 5, 7) in the decimal expansion of e.

0, 1, 4, 8, 11, 15, 16, 17, 18, 19, 22, 24, 26, 28, 29, 30, 33, 36, 37, 38, 39, 40, 42, 45, 50, 52, 53, 60, 62, 63, 64, 65, 68, 71, 73, 74, 75, 76, 78, 79, 82, 83, 85, 87, 89, 91, 92, 93, 98, 99, 101, 102, 106, 110, 111, 114, 116, 119

Offset: 1

Author

Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002

Keywords

• easy
• nonn
• base

Examples

			e=2.71828182... so the indices of prime digits are 0,1,4,8...
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A001113.

Programs

Mathematica

With[{edgs=RealDigits[E,10,120][[1]]},Flatten[Position[edgs,?(PrimeQ[#]&)]]-1] (* _Harvey P. Dale, Apr 11 2024 *)

Extensions

More terms from Ray G. Opao, Aug 31 2004