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 A007512 Primes of the form floor(e*10^k), i.e., formed by concatenation of an initial segment of the decimal expansion of e. (Formerly M2184) 12
 2, 271, 2718281, 2718281828459045235360287471352662497757247093699959574966967627724076630353547594571 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The number of digits in a(n) is given in A064118. This allows us to get larger terms that cannot be displayed here, via the given FORMULA. Sequences A005042, A072952, A115453, A119343, A210704, ... are the analogs for Pi, gamma, sqrt(2), sqrt(3), 3^(1/3), ... - M. F. Hasler, Aug 31 2013 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Table of n, a(n) for n=1..4. Eric Weisstein's World of Mathematics, e-Prime Index entries related to "constant primes". FORMULA a(n) = floor(e*10^(A064118(n)-1)). - M. F. Hasler, Aug 31 2013 MAPLE Digits := 110; n0 := evalf(E); for i from 1 to 100 do t1 := trunc(10^i*n0); if isprime(t1) then print(t1); fi; od: PROG (PARI) c=exp(1); for(k=0, precision(c), ispseudoprime(c\.1^k) & print1(c\.1^k, ", ")) \\ M. F. Hasler, Sep 01 2013 CROSSREFS Sequence in context: A278771 A318171 A324596 * A048534 A135696 A008775 Adjacent sequences: A007509 A007510 A007511 * A007513 A007514 A007515 KEYWORD base,nonn AUTHOR N. J. A. Sloane, Robert G. Wilson v, Simon Plouffe EXTENSIONS Next term is a 1781-digit BPSW-probable prime 2718281828459045235...211151368350627526023. - Randall L Rathbun, Feb 02 2002 Edited by T. D. Noe, Oct 30 2008 Edited by M. F. Hasler, Aug 31 2013 STATUS approved

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Last modified April 21 14:03 EDT 2024. Contains 371870 sequences. (Running on oeis4.)