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A191590 a(n) is the genus of the modular curve associated to the principal congruence subgroup of level p(n), where p(n) is the n-th prime number. 0
0, 0, 3, 26, 50, 133, 196, 375, 806, 1001, 1768, 2451, 2850, 3773, 5500, 7686, 8526, 11408, 13651, 14875, 18981, 22100, 27391, 35673, 40376, 42875, 48178, 50986, 56925, 81313, 89376, 102443, 107066, 132276, 137751, 155078, 173800, 187083, 208250, 230956, 238876, 281201 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Table of n, a(n) for n=2..43.

Jens Putzka, Aequivariante Signaturen und Darstellungen der Modulgruppe in der Kohomologie von Modulkurven, Master's Thesis (2006), page 18.

FORMULA

a(n) = (prime(n)+2)*(prime(n)-3)*(prime(n)-5)/24.

PROG

(PARI) a(p)=(p+2)*(p-3)*(p-5)/24;

forprime(p=3, 1000, print1(a(p), ", "));

CROSSREFS

Sequence in context: A062181 A058993 A083109 * A177511 A294494 A048372

Adjacent sequences:  A191587 A191588 A191589 * A191591 A191592 A191593

KEYWORD

nonn,easy

AUTHOR

Gaël Collinet, Jun 08 2011

STATUS

approved

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Last modified March 6 07:15 EST 2021. Contains 341842 sequences. (Running on oeis4.)