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| | [No title] |
 | | %e A098961 Sums not divisible by 13 are shown in asterisks: %e A098961.......1....4....9...16....25....36....49....64....81...100...121 %e A098961 ------------------------------------------------------------------ %e A098961 1......*....*....*....*....26.....*.....*....65.....*.....*.....* %e A098961 4......*....*...13....*.....*.....*.....*.....*.....*...104.....* %e A098961 9......*...13....*....*.....*.....*.....*.....*.....*.....*...130 %e A098961 16.....*....*....*....*.....*....52....65.....*.....*.....*.....* %e A098961 25....26....*....*....*.....*.....*.....*.....*.....*.....*.....* %e A098961 36.....*....*....*...52.....*.....*.....*.....*...117.....*.....* %e A098961 49.....*....*....*...65.....*.....*.....*.....*...130.....*.....* %e A098961 64....65....*....*....*.....*.....*.....*.....*.....*.....*.....* %e A098961 81.....*....*....*....*.....*...117...130.....*.....*.....*.....* %e A098961 100....*..104....*....*.....*.....*.....*.....*.....*.....*...221 %e A098961 121....*....*..130....*.....*.....*.....*.....*.....*...221.....* %Y A098961 Cf. |
 | | A008328 number of divisors of p-1, A008329 number of divisors of p+1, A103664, A103666, A103667. |
 | | %e A080387 for n=13:the central binomial coefficient(=1716) is divisible by 10 C[13,k] b,coefficients; the 4 non-divisible cases are as follows: C[13,4],C[13,5],C[13,8],C[13,9]. |
| www.research.att.com /~njas/sequences/eisBTfry00097.txt (5084 words) |
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