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A133196
n+2 repeated n times.
2
3, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15
OFFSET
1,1
FORMULA
a(n) = A003056(n)+3, a(n) = A003057(n)+1; a(n) = t+3, where t=floor((-1+sqrt(8*n-7))/2). - Boris Putievskiy, May 07 2013
MATHEMATICA
Table[PadRight[{}, n, n+2], {n, 20}]//Flatten (* Harvey P. Dale, Sep 04 2019 *)
PROG
(Python)
from math import isqrt
def A133196(n): return 2+(isqrt(8*n)+1)//2 # Chai Wah Wu, Oct 17 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Curtz, Oct 09 2007
STATUS
approved