A177982 -id:A177982 - cp's OEIS frontend

A169798 a(n) = smallest prime number > a(n-1) that contains the n-th composite number as a substring.

41, 61, 83, 89, 101, 127, 149, 151, 163, 181, 1201, 1213, 1223, 1249, 1259, 2267, 2273, 2281, 2309, 3203, 3301, 3343, 3359, 3361, 3389, 3391, 3407, 4201, 4409, 4451, 4463, 4481, 4493, 4507, 4513, 4523, 4547, 5501, 5563, 5573, 5581, 6007, 6203, 6263, 6421

Offset: 1

N. J. A. Sloane, May 15 2010

Zak Seidov, Table of n,a(n) for n=1..1000

Cf. A144565.

Cf. A177981, A177982. [From Reinhard Zumkeller, May 16 2010]

Corrected and extended by Zak Seidov and D. S. McNeil, May 16 2010

A144565 a(n) is the smallest composite number > a(n-1) that contains the n-th prime as a substring.

Original entry on oeis.org

12, 30, 35, 57, 110, 130, 170, 190, 230, 290, 310, 370, 410, 430, 447, 453, 459, 561, 567, 671, 730, 779, 783, 789, 897, 1010, 1030, 1070, 1090, 1113, 1127, 1131, 1137, 1139, 1149, 1510, 1570, 1630, 1670, 1730, 1790, 1810, 1910, 1930, 1970, 1990, 2110

Offset: 1

Eric Angelini, May 01 2010

			S = 12,30,35,57,110,130,170,190,230,290,310,370,410,430,447,...
p = .2.3...5..7.11..13..17..19..23..29..31..37..41..43...47...

Cf. A169798.

Cf. A177981, A177982. [Reinhard Zumkeller, May 16 2010]

a(n) <= 10*n. [Reinhard Zumkeller, May 16 2010]

Typo in example corrected by D. S. McNeil, May 16 2010

Corrected and extended by D. S. McNeil and Reinhard Zumkeller, May 16 2010

A177981 a(n) = prime number > a(n-1) that contains the n-th prime as a substring.

Original entry on oeis.org

23, 31, 53, 67, 113, 131, 173, 191, 223, 229, 311, 337, 419, 431, 479, 653, 659, 661, 673, 719, 733, 797, 839, 1289, 1297, 5101, 7103, 10709, 10903, 11113, 11273, 11311, 13709, 13901, 14149, 15101, 15727, 16301, 16703, 17317, 17903, 18119, 18191

Offset: 1

Reinhard Zumkeller, May 16 2010

			.. prime(n): 2_ 3_ 5_ _7 11_ 13_ 17_ 19_ _23 _29 31_ _37
...... a(n): 23 31 53 67 113 131 173 191 223 229 311 337 .

Cf. A144565, A169798, A177982.

cp's OEIS Frontend

A169798 a(n) = smallest prime number > a(n-1) that contains the n-th composite number as a substring.

Views

Author

Keywords

Links

Crossrefs

Extensions

A144565 a(n) is the smallest composite number > a(n-1) that contains the n-th prime as a substring.

Views

Author

Keywords

Examples

Crossrefs

Formula

Extensions

A177981 a(n) = prime number > a(n-1) that contains the n-th prime as a substring.

Views

Author

Keywords

Examples

Crossrefs