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A176035 Difference between product of two distinct primes and previous perfect square. 1
2, 1, 5, 6, 5, 6, 1, 8, 9, 10, 2, 3, 10, 2, 6, 8, 9, 13, 1, 5, 10, 13, 1, 4, 5, 6, 10, 12, 13, 14, 6, 11, 15, 18, 19, 1, 2, 8, 12, 13, 20, 21, 22, 1, 2, 11, 14, 15, 17, 22, 8, 9, 14, 16, 18, 25, 5, 6, 7, 9, 10, 13, 17, 18, 19, 21, 22, 23, 25, 1, 10, 12, 22, 24, 28, 29, 3, 6, 9, 11, 18, 22, 31 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

6-4=2, 10-9=1, 14-9=5, 15-9=6, 21-16=5,..

LINKS

Table of n, a(n) for n=1..83.

MATHEMATICA

f1[n_]:=Floor[Sqrt[n]]; f2[n_]:=Last/@FactorInteger[n]=={1, 1}; lst={}; Do[If[f2[n], AppendTo[lst, n-f1[n]^2]], {n, 0, 5!}]; lst

CROSSREFS

Cf. A006881, A056892, A106044, A176032, A176033, A176034

Sequence in context: A075680 A192024 A249283 * A190992 A160166 A197683

Adjacent sequences:  A176032 A176033 A176034 * A176036 A176037 A176038

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Apr 06 2010

STATUS

approved

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Last modified September 21 07:28 EDT 2021. Contains 347596 sequences. (Running on oeis4.)