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A215152 Number of sphenic triples up to 10^n. 1
0, 0, 0, 21, 445, 5457, 55576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

The sphenic triples {1309, 1310, 1311}, {1885, 1886, 1887}, ... are counted once at a time.

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Cf. A007304, A215217, A066509, A215218, A215015.

Sequence in context: A285873 A189433 A041842 * A199252 A199197 A219419

Adjacent sequences:  A215149 A215150 A215151 * A215153 A215154 A215155

KEYWORD

nonn

AUTHOR

Martin Renner, Aug 06 2012

STATUS

approved

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Last modified September 30 02:03 EDT 2020. Contains 337432 sequences. (Running on oeis4.)