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 A129633 The sum of the decimal digits of all primes up to and including the primes listed equals a prime. 1
 2, 3, 7, 11, 13, 17, 19, 31, 37, 43, 83, 137, 191, 197, 223, 311, 347, 359, 367, 389, 449, 491, 499, 503, 521, 601, 647, 683, 733, 751, 809, 857, 881, 887, 919, 953, 1019, 1033, 1061, 1087, 1193, 1223, 1229, 1277, 1291, 1301, 1367, 1459 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Up to 50000 there are only five groups of twins: (11,13) - (17,19) - (2141,2143) - (3939,3931) - (48677,48679). - Carmine Suriano, Jul 22 2010, corrected by Robert Israel, Feb 25 2022 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE For 17, 2 + 3 + 5 + 7 + 1+1 + 1+3 + 1+7 = 31, which is prime. MAPLE S:= 0: R:= NULL: count:= 0: p:= 1: while count < 100 do p:= nextprime(p); S:= S + convert(convert(p, base, 10), `+`); if isprime(S) then count:= count+1; R:= R, p; fi od: R; # Robert Israel, Feb 25 2022 MATHEMATICA a = {}; su = 0; For[n = 1, n < 300, n++, su = su + Plus@@IntegerDigits[Prime[n]]; If[PrimeQ[su], AppendTo[a, Prime[n]]]]; a (* Stefan Steinerberger, Jun 08 2007 *) CROSSREFS Sequence in context: A265760 A071200 A038921 * A020622 A045320 A045321 Adjacent sequences: A129630 A129631 A129632 * A129634 A129635 A129636 KEYWORD nonn,base AUTHOR J. M. Bergot, May 31 2007 EXTENSIONS More terms from Stefan Steinerberger, Jun 08 2007 STATUS approved

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Last modified April 15 14:37 EDT 2024. Contains 371689 sequences. (Running on oeis4.)