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A076578 Triangular numbers which are 4-almost primes. 2
36, 136, 210, 276, 351, 666, 820, 1035, 1225, 1275, 1326, 1431, 1770, 1830, 1953, 2145, 2346, 2415, 2775, 2926, 3003, 3486, 3916, 4005, 4186, 4278, 5050, 5356, 5565, 6105, 6555, 6670, 6903, 7626, 8001, 8385, 8646, 9316, 9730, 10731, 11175, 11325 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

a(1)=36, 36 is a triangular number and 36=2*2*3*3 i.e. is a product of 4 prime factors so is 4-almost prime.

CROSSREFS

Sequence in context: A196891 A105090 A254284 * A044368 A044749 A067865

Adjacent sequences:  A076575 A076576 A076577 * A076579 A076580 A076581

KEYWORD

base,easy,nonn

AUTHOR

Shyam Sunder Gupta, Oct 19 2002

STATUS

approved

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Last modified June 28 19:10 EDT 2022. Contains 354907 sequences. (Running on oeis4.)