|
| |
|
|
A157529
|
|
Composite numbers such that the first digit is equal to the sum of all the other digits.
|
|
1
| |
|
|
22, 33, 44, 55, 66, 77, 88, 99, 110, 202, 220, 303, 312, 321, 330, 404, 413, 422, 440, 505, 514, 532, 550, 606, 615, 624, 633, 642, 651, 660, 707, 716, 725, 734, 752, 770, 808, 817, 826, 835, 844, 862, 871, 880, 909, 918, 927, 936, 945, 954, 963, 972, 981
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| 990 is a composite number where the first digit is equal to the sum of all the other digits.
|
|
|
MAPLE
| a := proc (n) local nn: nn := convert(n, base, 10): if isprime(n) = false and nn[nops(nn)] = add(nn[j], j = 1 .. nops(nn)-1) then n else end if end proc: seq(a(n), n = 2 .. 1100); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 07 2009]
|
|
|
CROSSREFS
| A002808
Sequence in context: A084996 A157496 A096768 * A165932 A190588 A072041
Adjacent sequences: A157526 A157527 A157528 * A157530 A157531 A157532
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 02 2009
|
|
|
EXTENSIONS
| Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 07 2009
|
| |
|
|
