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 A073302 Indices of prime digits (2, 3, 5, 7) in the decimal expansion of e. 2
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE e=2.71828182... so the indices of prime digits are 0,1,4,8... MATHEMATICA With[{edgs=RealDigits[E, 10, 120][[1]]}, Flatten[Position[edgs, _?(PrimeQ[#]&)]]-1] (* Harvey P. Dale, Apr 11 2024 *) CROSSREFS Cf. A001113. Sequence in context: A311048 A355750 A311049 * A191105 A248232 A047346 Adjacent sequences: A073299 A073300 A073301 * A073303 A073304 A073305 KEYWORD easy,nonn,base AUTHOR Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002 EXTENSIONS More terms from Ray G. Opao, Aug 31 2004 STATUS approved

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Last modified September 10 16:40 EDT 2024. Contains 375791 sequences. (Running on oeis4.)