148 (number)
| ||||
|---|---|---|---|---|
| Cardinal | one hundred forty-eight | |||
| Ordinal | 148th (one hundred forty-eighth) | |||
| Factorization | 22 × 37 | |||
| Divisors | 1, 2, 4, 37, 74, 148 | |||
| Greek numeral | ΡΜΗ´ | |||
| Roman numeral | CXLVIII | |||
| Binary | 100101002 | |||
| Ternary | 121113 | |||
| Quaternary | 21104 | |||
| Quinary | 10435 | |||
| Senary | 4046 | |||
| Octal | 2248 | |||
| Duodecimal | 10412 | |||
| Hexadecimal | 9416 | |||
| Vigesimal | 7820 | |||
| Base 36 | 4436 | |||
148 (one hundred [and] forty-eight) is the natural number following 147 and before 149.
In mathematics
148 is the second number to be both a heptagonal number and a centered heptagonal number (the first is 1).[1] It is the twelfth member of the Mian–Chowla sequence, the lexicographically smallest sequence of distinct positive integers with distinct pairwise sums.[2]
There are 148 perfect graphs with six vertices,[3] and 148 ways of partitioning four people into subsets, ordering the subsets, and selecting a leader for each subset.[4]
In other fields
In the Book of Nehemiah 7:44 there are 148 singers, sons of Asaph, at the census of men of Israel upon return from exile. This differs from Ezra 2:41, where the number is given as 128.[5]
Dunbar's number is a theoretical cognitive limit to the number of people with whom one can maintain stable interpersonal relationships. Dunbar predicted a "mean group size" of 148,[6] but this is commonly rounded to 150.
See also
- The year AD 148 or 148 BC
- List of highways numbered 148
- All pages with titles containing 148
References
- ↑ Sloane, N. J. A., ed. "Sequence A128919 (Numbers simultaneously heptagonal and centered heptagonal)". OEIS Foundation. https://oeis.org/A128919.
- ↑ Sloane, N. J. A., ed. "Sequence A005282 (Mian-Chowla sequence)". OEIS Foundation. https://oeis.org/A005282.
- ↑ Sloane, N. J. A., ed. "Sequence A052431 (Number of perfect simple undirected graphs on n nodes)". OEIS Foundation. https://oeis.org/A052431.
- ↑ Sloane, N. J. A., ed. "Sequence A006153 (E.g.f.: 1/(1-x*exp(x)))". OEIS Foundation. https://oeis.org/A006153.
- ↑ Klein, Ralph Walter (January 1969). "Old Readings in 1 Esdras: The List of Returnees From Babylon (Ezra 2 // Nehemiah 7)". Harvard Theological Review 62 (1): 99–107. doi:10.1017/s0017816000027644.
- ↑ Dunbar, R. I. M. (1997). "Groups, Gossip, and the Evolution of Language". in Schmitt, Alain; Atzwanger, Klaus; Grammer, Karl et al.. New Aspects of Human Ethology. Kluwer Academic Publishers. pp. 77–89. doi:10.1007/978-0-585-34289-4_5.
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