Sequenze

Data una certa sequenza di numeri bisogna individuare il prossimo valore (1,  2,  3,  4,  5,  …) oppure il valore mancante (1, 2,  …,  4,  5, 6)

Il pallino colorato indica l’origine del quesito

• Olimpiadi Italiane di Informatica
• Test d’ingresso Medicina…
• Concorso a cattedra 2012
• Esiste sempre una sequenza?

QUESITI

• 1, 1, 2, 3, 5, 8, ♥
• 1, 3, 5, 7, 9, ♥
• 1, 3, 6, 10, 15, 21, ♥
• 1, 4, 9, 16, 25, ♥
• 1, 8, 27, 64, 125, ♥
• 2, 3, 4, 12, 6, 23, 8, 36, 10, 51, 12, ♥
• 2, 3, 5, 7, 9, ♥
•  2, 3, 7, 13, 27, ♥, ♥
• 2, 4, 6, 8, 10, ♥
• 2, 8, 4, 7, 8, 6, 16, 5, ♥, ♥
• 3, 5, 9, 17, 33, 65, ♥
• 5, 14, 32, 68, 140, 284, ♥
• 6, 7, 4, 6, 5, 4, 5, 5, 2, ♥
• 7, 8, 10, 14, 22, 38, 70, ♥
• 8, 15, 29, 57, 113, 225, ♥
• 9, 18, 16, 14, 23, 10, ♥, ♥
• 11, 12, 25, 76, 77, 155, 466, 467, ♥
• 11, 33, 21, 63, 51, 153, ♥, ♥
• 16, 152, 32, 76, 64, 38, 128, ♥, ♥
• 19, 22, 31, 58, ♥
• 20, 42, 36, ♥, ♥, 74, 68, 90
• 23, 64, 55, 70, ♥, ♥, 117, 158
• ♥, ♥, 37, 62, 42, 65, 47, 68
• 42, 86, 74, 32, ♥, ♥, 22, 66
• ♥, ♥, 44, 41, 36, 33, 28, 25, 20
• 60, 95, 52, ♥, ♥, 78, 112, 147
• 79, 96, 89, 106, 99, 116, ♥
• 86, 105, 78, ♥, ♥, 88, 106, 125
• 87, 73, 103, 89, ♥, 105, 135, ♥
• 200, 196, 180, 116, ♥

a volte compaiono le lettere dell’alfabeto (21)

1. A, T, ♥, M, H, ♥
2. D, T, E, R, F, P, G, ♥
3. ♥, P, L, F, B
4. ♥, Q, N, I, F
5. S, Q, N, H, ♥, T
6. V, S, O, L, F, ♥

oppure compaiono lettere (21) e numeri

1. B, 43, V, 36, Q, 31, N, 24, ♥, ♥
2. B, 76, O, 64, C, 52, P, 40, ♥, ♥
3. E, 114, G, 96, I, 78, ♥, 60, O, ♥
4. H, 111, L, 93, N, 75, ♥, 57, R, ♥
5. O, 64, I, 32, E, 16, ♥, ♥
6. ♥, ♥, T, 7, Q, 11, N, 15, I

oppure sono cervellotiche

• 1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, 31131211131221, 13211311123113112211, ♥
• …

RISORSE ONLINE

1. OEIS – The On-Line Encyclopedia of Integer Sequences
2. BASE Cinque: Serie e sequenze di numeri
3. Concorsando – Guida sulle serie numeriche – Guida sulle serie alfanumeriche – TEST DI LOGICA

PDF

1. Logica
2. Serie numeriche, alfabetiche, alfanumeriche
3. …

LIBRI

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