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 A209835 Smallest k >= 0 such that 2k + (n-th average of twin prime pairs) is oblong number. 0
 1, 0, 0, 1, 0, 0, 6, 0, 4, 1, 9, 3, 1, 9, 6, 6, 0, 1, 12, 15, 16, 0, 15, 0, 15, 15, 0, 16, 4, 21, 1, 24, 21, 6, 24, 18, 12, 3, 30, 15, 19, 15, 27, 21, 15, 6, 27, 15, 0, 36, 16, 10, 27, 12, 0, 9, 10, 7, 24, 15, 36, 21, 40, 37, 25, 16, 10, 9, 42, 21, 6, 34, 0, 30, 49, 34, 22, 13, 36, 30, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS Averages of twin prime pairs of the form n(n+1): 6, 12, 30, 42, 72, 240, 420, 462, 600, 1482, 1722, 2550, 2970, 3540, 4422, 8010, 10302, 17292, 19182, 20022, 23562, 24180, 27060, 31152... , multiples of 6 as stated in A002822. LINKS Table of n, a(n) for n=1..81. CROSSREFS Cf. A002378, A014574. Sequence in context: A019766 A094830 A196878 * A344973 A298528 A341325 Adjacent sequences: A209832 A209833 A209834 * A209836 A209837 A209838 KEYWORD nonn AUTHOR Gerasimov Sergey, Mar 14 2012 EXTENSIONS Corrected by R. J. Mathar, Mar 15 2012 STATUS approved

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Last modified June 19 16:17 EDT 2024. Contains 373503 sequences. (Running on oeis4.)