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 A095672 Primes p = p_(n+1) such that p_n + p_(n+2) = 2*p_(n+1) + 4. 8
 31, 61, 73, 151, 271, 293, 337, 401, 433, 491, 547, 571, 577, 601, 743, 761, 839, 911, 1033, 1039, 1063, 1201, 1231, 1291, 1321, 1409, 1453, 1531, 1571, 1621, 1627, 2003, 2017, 2039, 2131, 2243, 2273, 2341, 2383, 2551, 2663, 2713, 2719, 2791, 3041, 3049 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes that are first prime chords. These come from music based on the prime differences where the chords are an even number of note steps from the primary note. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE 31 is a term because 29+37 = 2*31 + 4 = 66. MAPLE primes:= select(isprime, [seq(i, i=3..10000, 2)]): L:= primes[1..-3]+primes[3..-1]-2*primes[2..-2]: primes[select(t -> L[t-1]=4, [\$2..nops(L)+1])]; # Robert Israel, Jun 28 2018 MATHEMATICA m = 1; Prime[1 + Select[ Range[450], Prime[ # + 2] - 2*Prime[ # + 1] + Prime[ # ] - 4*m == 0 &]] (* Robert G. Wilson v, Jul 14 2004 *) CROSSREFS Cf. A095419, A095420, A095648, A095649, A095650, A095651, A095673. Sequence in context: A189556 A185934 A052158 * A073650 A078562 A054804 Adjacent sequences:  A095669 A095670 A095671 * A095673 A095674 A095675 KEYWORD nonn AUTHOR Roger L. Bagula, Jul 02 2004 EXTENSIONS Edited by Robert G. Wilson v, Jul 14 2004 Description corrected by N. J. A. Sloane, Jul 19 2004 STATUS approved

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Last modified May 19 20:41 EDT 2019. Contains 323410 sequences. (Running on oeis4.)