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 A187975 Positions of 1 in the zero-one sequence given by s(n)=[nr+5r]-[nr]-[5r], where r=sqrt(2), n>=1, [ ]=floor. 1
 12, 24, 41, 53, 70, 82, 94, 111, 123, 140, 152, 164, 181, 193, 210, 222, 239, 251, 263, 280, 292, 309, 321, 333, 350, 362, 379, 391, 408, 420, 432, 449, 461, 478, 490, 502, 519, 531, 548, 560, 572, 589, 601, 618, 630, 647, 659, 671, 688, 700, 717, 729, 741, 758, 770, 787, 799, 816, 828, 840, 857, 869, 886, 898, 910, 927, 939, 956 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A187950. LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10000 EXAMPLE A187975(n) is the position of the n-th 1 in the titular sequence (s(n)), which begins with 0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0. MATHEMATICA r=2^(1/2); seqA=Table[Floor[(n+5)r]-Floor[n*r]-Floor[5r], {n, 1, 220}] Flatten[Position[seqA, 0] ] Flatten[Position[seqA, 1] ] (* A187975 *) PROG (Python) from gmpy2 import isqrt A187975_list = [n for n in range(1, 10**6) if isqrt(2*(n+5)**2) - isqrt(2*n**2) == 8] # Chai Wah Wu, Oct 08 2016 CROSSREFS Cf. A187950. Sequence in context: A053990 A026365 A051435 * A190566 A361856 A213739 Adjacent sequences: A187972 A187973 A187974 * A187976 A187977 A187978 KEYWORD nonn AUTHOR Clark Kimberling, Mar 17 2011 STATUS approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)