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A167887 n-th single or isolated number plus n-th non-single or nonisolated number. 0
2, 5, 9, 17, 25, 31, 39, 47, 53, 60, 67, 75, 83, 89, 98, 103, 110, 119, 126, 133, 139, 154, 159, 167, 181, 189, 196, 201, 208, 216, 230, 237, 251, 264, 271, 277, 285, 297, 305, 312, 320, 328, 334, 347, 362, 368, 374, 389, 396, 409, 415, 422, 431, 438, 445, 451 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..56.

FORMULA

a(n)=A167706(n)+A167707(n).

EXAMPLE

a(1)=2+0=2, a(2)=4+1=5, a(3)=6+3=9, a(4)=12+5=17.

CROSSREFS

Cf. A167706, A167707.

Sequence in context: A036711 A080740 A123324 * A023603 A062492 A268346

Adjacent sequences:  A167884 A167885 A167886 * A167888 A167889 A167890

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Nov 14 2009

EXTENSIONS

All terms > 110 corrected by R. J. Mathar, May 30 2010

STATUS

approved

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Last modified December 9 21:41 EST 2016. Contains 278987 sequences.