The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A307784 a(n) is the square root of A034175(n) + A034175(n+1). 1
 1, 2, 3, 4, 5, 6, 5, 3, 4, 5, 4, 3, 4, 5, 6, 7, 8, 9, 8, 7, 8, 9, 10, 8, 5, 6, 7, 8, 9, 10, 9, 7, 8, 9, 8, 7, 8, 9, 10, 8, 5, 6, 7, 8, 9, 10, 9, 8, 9, 10, 11, 12, 13, 14, 13, 12, 11, 9, 10, 11, 12, 13, 12, 11, 12, 13, 14, 15, 14, 12, 13, 14, 13, 12, 11, 12, 14 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The sum of two consecutive terms of A034175 is always a perfect square. LINKS Rémy Sigrist, Table of n, a(n) for n = 0..10000 FORMULA a(n)^2 = A034175(n) + A034175(n+1). EXAMPLE For n = 12: - A034175(12) + A034175(13) = 7 + 9 = 16 = 4^2, - hence a(12) = 4. PROG (PARI) p=0; s=0; for (n=1, 77, s+=2^p; for (v=0, oo, if (!bittest(s, v) && issquare(p+v), print1 (sqrtint(p+v) ", "); p=v; break))) CROSSREFS Cf. A034175. Sequence in context: A070667 A245349 A122416 * A134665 A271832 A063260 Adjacent sequences:  A307781 A307782 A307783 * A307785 A307786 A307787 KEYWORD nonn AUTHOR Rémy Sigrist, Apr 28 2019 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 7 23:16 EDT 2022. Contains 355995 sequences. (Running on oeis4.)