155

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155 is an integer. Note that 155 = 5 × 31 and 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 = 155.

Membership in core sequences

Odd numbers	..., 149, 151, 153, 155, 157, 159, 161, ...	A005408
Composite numbers	..., 152, 153, 154, 155, 156, 158, 159, ...	A002808
Semiprimes	..., 146, 155, 158, 159, 161, 166, 169, ...	A001358
Squarefree numbers	..., 149, 151, 154, 155, 157, 158, 159, ...	A005117

Sequences pertaining to 155

Multiples of 155	0, 155, 310, 465, 620, 775, 930, 1085, 1240, 1395, 1550, 1705, 1860, ...
$3x+1$ sequence starting at 95	..., 103, 310, 155, 466, 233, 700, 350, 175, 526, 263, 790, 395, 1186, ...	A008875

Partitions of 155

There are 66493182097 partitions of 155.

Roots and powers of 155

In the table below, irrational numbers are given truncated to eight decimal places.

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Values for number theoretic functions with 155 as an argument

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Factorization of some small integers in a quadratic integer ring adjoining −155, 155

REMARKS

TABLE

Ideals help us make sense of these distinct factorizatons.

TABLE

Factorization of 155 in some quadratic integer rings

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TABLE GOES HERE

Representation of 155 in various bases

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See also

Some integers

							$-1$
0	1	2	3	4	5	6	7	8	9
10	11	12	13	14	15	16	17	18	19
20	21	22	23	24	25	26	27	28	29
30	31	32	33	34	35	36	37	38	39
40	41	42	43	44	45	46	47	48	49
					1729