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A145198 a(n) is the least number not already in the sequence and not the product of consecutive terms in the sequence. 1
1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..72.

PROG

(PARI) {m=72; v=vector(m); z=2*m; u=vectorsmall(z); k=1; for(n=1, m, while(u[k], k++); v[n]=k; u[k]=1; j=n-1; p=k; while(j>0&&(p=p*v[j])<=z, u[p]=1; j--)); for(i=1, m, print1(v[i], ", "))} \\ Klaus Brockhaus, Oct 06 2008

HP 49G calculator program from Gerald Hillier, Oct 24 2008

<< 0 OVER NDUPN

->LIST DUPDUP + 1 0

0 -> M V U K J P

<< 1 M

FOR N K

WHILE U OVER

GET

REPEAT 1 +

END 'K' STO V

N K PUT 'V' STO U K

1 PUT N 1 - 'J' STO

K 'P' STO

WHILE J 0 >

IF

THEN P V J

GET * DUP 'P' STO M

2 * <=

ELSE 0

END

REPEAT P 1

PUT J 1 - 'J' STO

END 'U' STO

NEXT V

>>

>>

CROSSREFS

Cf. A145278 (complement).

Sequence in context: A121229 A286291 A286926 * A083210 A187392 A232741

Adjacent sequences:  A145195 A145196 A145197 * A145199 A145200 A145201

KEYWORD

nonn

AUTHOR

Gerald Hillier, Oct 04 2008

EXTENSIONS

Extended by Klaus Brockhaus, Oct 06 2008

STATUS

approved

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Last modified May 27 07:59 EDT 2017. Contains 287203 sequences.