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 A226557 a(n) = |A020497(n) - prime(n+4) + 10|. 0
 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 2, 4, 2, 2, 0, 2, 4, 12, 12, 4, 6, 4, 8, 2, 6, 6, 4, 2, 0, 0, 6, 2, 4, 2, 8, 0, 2, 4, 2, 4, 8, 10, 6, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS Approximation of A020497(n) by function of the form prime(n+k) - c, where k,c are constants. The choice k=4 is stipulated by removing 2 and 5 from the considered prime constellations and 11 is chosen as the first prime (for n=1), since the second constellation {11,13} should be a twin pair. The choice c=10 corresponds to a(0) = 0. a(n) = 0 for n=1,2,3,4,5,7,8,9,10,11,12,13,14,15,16,22,36,37,43,... LINKS Table of n, a(n) for n=1..51. CROSSREFS Cf. A020497. Sequence in context: A321537 A218876 A028621 * A067898 A010106 A096159 Adjacent sequences: A226554 A226555 A226556 * A226558 A226559 A226560 KEYWORD nonn AUTHOR Vladimir Shevelev, Jun 10 2013 STATUS approved

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Last modified March 3 12:51 EST 2024. Contains 370512 sequences. (Running on oeis4.)