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A076581 Triangular numbers which are 7-almost primes. 0
2080, 4560, 8128, 9180, 10296, 10440, 12720, 12880, 15400, 18336, 18528, 21528, 23220, 23436, 29403, 29646, 37128, 39060, 43956, 52326, 56280, 61425, 64980, 67896, 70500, 81810, 82215, 86320, 86736, 93096, 93528, 100576, 103740, 105570 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..34.

EXAMPLE

a(1)=2080, 2080 is a triangular number and 2080=2*2*2*2*2*5*13 i.e. is a product of 7 prime factors so is 7-almost prime.

CROSSREFS

Sequence in context: A249654 A180921 A270537 * A183675 A178272 A194605

Adjacent sequences:  A076578 A076579 A076580 * A076582 A076583 A076584

KEYWORD

base,easy,nonn

AUTHOR

Shyam Sunder Gupta, Oct 19 2002

STATUS

approved

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Last modified May 29 08:14 EDT 2022. Contains 354124 sequences. (Running on oeis4.)